Add extraction modes; fix resume; hide Nextcloud/Upload for users; delete PREP 2013 questions

Extraction modes (no restart needed — code ready for next Celery deploy):
- New QuizCreate.extraction_mode field: standard|questions_only|two_step|regex|ai_decide
- extraction_modes.py: independent implementations that don't touch standard path
  - questions_only: extract Q+options, correct_answer="PENDING" for manual fill
  - two_step: separate answer key section scan + phase1/2/3 matching
  - regex: AI detects answer pattern, generates regex, applies to full doc
  - ai_decide: AI reads samples from start+end and picks strategy
- DocumentDetailPage: Extraction Mode dropdown with description per mode
- quiz_tasks.py: routes to correct mode, standard path completely unchanged

Database:
- Deleted 11 orphaned questions from PREP 2013 extraction (quiz 12 was already deleted)
- 268 questions remaining (all PREP 2012)

UI fixes:
- Nextcloud section in Settings now only shown to moderators/admins
  (regular users can't upload PDFs so they don't need Nextcloud)
- Upload PDF already hidden in navbar for non-moderators (confirmed correct)
- Resume quiz: now async — study mode quiz data loaded BEFORE showing quiz
  so correct_answer is available immediately for feedback
- Resume saves and restores voice selection
- voice field added to ProgressSave schema and Redis storage
- Progress save dependency includes selectedVoice

Attempts:
- POST /attempts/start: reuses existing incomplete attempt by default (fresh=false)

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

backend/app/routers/attempts.py

@@ -182,6 +182,7 @@ class ProgressSave(BaseModel):
     answers: dict  # {question_id: answer}
     current_idx: int
     mode: str
+    voice: str | None = None
 
 
 @router.post("/progress")
@@ -200,6 +201,7 @@ def save_progress(
             "answers": data.answers,
             "current_idx": data.current_idx,
             "mode": data.mode,
+            "voice": data.voice,
         }))
     except Exception:
         pass  # Redis unavailable — degrade gracefully

backend/app/routers/quizzes.py

@@ -57,6 +57,7 @@ def create_quiz(
             time_limit_minutes=quiz_data.time_limit_minutes,
             model_id=quiz_data.model_id,
             question_category_id=quiz_data.question_category_id,
+            extraction_mode=quiz_data.extraction_mode,
         )
     except Exception:
         # Celery/Redis unavailable — fall back to synchronous extraction

backend/app/schemas/quiz.py

@@ -10,6 +10,12 @@ class QuizCreate(BaseModel):
     time_limit_minutes: int | None = None
     model_id: str | None = None  # override extraction model
     question_category_id: int | None = None  # assign extracted questions to this bank category
+    extraction_mode: str = "standard"
+    # standard      — current working mode (inline Correct Answer / Preferred Response)
+    # questions_only — extract Q+options only, no answers (admin fills later)
+    # two_step       — separate answer key section (PREP 2013 style)
+    # regex          — AI analyses format then extracts answer key with regex
+    # ai_decide      — AI reads a sample and decides which approach to use
 
 
 class QuestionResponse(BaseModel):

backend/app/services/extraction_modes.py

@@ -0,0 +1,380 @@
+"""Additional extraction modes that run alongside (not replacing) the standard extractor.
+
+Modes
+-----
+questions_only   Extract Q+options with no answers. User fills answers later via QuizEditPage.
+two_step         Separate answer key section (PREP 2013): Phase 1 = questions, Phase 2 = key, Phase 3 = match.
+regex            AI generates a regex pattern for the document's answer format, then we apply it.
+ai_decide        AI samples the document and picks standard / two_step / questions_only.
+"""
+from __future__ import annotations
+import json
+import logging
+import re
+
+from app.services import ai_service, vector_service
+
+logger = logging.getLogger(__name__)
+
+
+def _normalize(text: str) -> str:
+    return (text.replace("Pref erred", "Preferred").replace("Pre ferred", "Preferred")
+            .replace("Prefer red", "Preferred").replace("ltem", "Item").replace("ltcm", "Item"))
+
+
+# ─── QUESTIONS ONLY ──────────────────────────────────────────────────────────
+
+QUESTIONS_ONLY_PROMPT = """Extract every question from this PREP exam content.
+Do NOT look for correct answers — we only need the question text and answer options.
+
+Return ONLY JSON:
+{{"questions": [
+  {{
+    "item_number": "<digits only, or null>",
+    "question_text": "<full vignette + stem>",
+    "question_type": "mcq",
+    "options": ["<A>", "<B>", "<C>", "<D>", "<E>"],
+    "page_reference": {page_ref}
+  }}
+]}}
+
+Rules:
+- A new question starts with "Item NNN" or "ltem NNN".
+- Extract ALL questions even if no answer is visible.
+- Do NOT include answer explanations or "Preferred Response:" content as questions.
+- Return ONLY JSON — no markdown, no preamble.
+
+Content (pages {page_info}):
+{content}"""
+
+
+def extract_questions_only(content: str, page_info: str, page_ref: int | None,
+                            model_id: str | None, api_key: str | None) -> list[dict]:
+    """Extract questions + options with correct_answer = PENDING (to be filled by admin)."""
+    content = ai_service._truncate_content(content)
+    prompt = QUESTIONS_ONLY_PROMPT.format(
+        content=content, page_info=page_info,
+        page_ref=page_ref if page_ref else "null",
+    )
+    for attempt in range(3):
+        try:
+            text = ai_service._call_model(prompt, model_id, api_key).strip()
+            if text.startswith("```"):
+                text = text.split("\n", 1)[1] if "\n" in text else text[3:]
+                if text.endswith("```"):
+                    text = text[:-3]
+                text = text.strip()
+            data = json.loads(text)
+            qs = data.get("questions", data) if isinstance(data, dict) else data
+            result = []
+            for q in qs:
+                if not q.get("question_text"):
+                    continue
+                result.append({
+                    "item_number": str(q.get("item_number") or "").strip().lstrip("0") or None,
+                    "question_text": q["question_text"],
+                    "question_type": q.get("question_type", "mcq"),
+                    "options": q.get("options"),
+                    "correct_answer": "PENDING",  # placeholder — admin fills via QuizEditPage
+                    "explanation": "",
+                    "page_reference": q.get("page_reference"),
+                })
+            if result:
+                return result
+            raise ValueError("No questions found")
+        except Exception as e:
+            logger.warning(f"questions_only attempt {attempt + 1}: {e}")
+    raise RuntimeError("questions_only extraction failed after 3 attempts")
+
+
+# ─── TWO-STEP (SEPARATE ANSWER KEY) ─────────────────────────────────────────
+
+def extract_two_step(
+    document_id: int,
+    section_start: int,
+    section_end: int,
+    model_id: str | None,
+    api_key: str | None,
+    push_step,          # callable(step, message) to report progress
+    chunk_pages: int = 50,
+) -> tuple[list[dict], list[str]]:
+    """
+    Two-phase extraction for PDFs with questions in the first half
+    and a separate answer key section (e.g. PREP 2013 "Preferred Response:").
+
+    Returns (valid_questions, skipped_list).
+    Raises ValueError if answer section not found or no questions matched.
+    """
+    total = section_end - section_start + 1
+    min_answer_start = section_start + max(20, int(total * 0.20))
+
+    # Scan for answer key boundary
+    push_step("ai", "Two-step mode: scanning for answer key section…")
+    answer_section_start = None
+    for scan_p in range(min_answer_start, section_end, 10):
+        raw = vector_service.get_pages_text(document_id=document_id, start_page=scan_p,
+                                             end_page=min(scan_p + 9, section_end))
+        if raw and ("Preferred Response:" in _normalize(raw) or
+                    "preferred response:" in raw.lower()):
+            answer_section_start = max(section_start, scan_p - 5)
+            break
+
+    if not answer_section_start:
+        raise ValueError(
+            "Two-step mode: could not find a separate answer key section "
+            "(no 'Preferred Response:' found after the first 20% of pages). "
+            "Try 'Standard' mode instead."
+        )
+
+    push_step("ai", f"Answer key section starts around page {answer_section_start}.")
+
+    q_end = answer_section_start - 1
+    q_chunks = []
+    p = section_start
+    while p <= q_end:
+        end = min(p + chunk_pages - 1, q_end)
+        q_chunks.append((p, end))
+        p = end + 1
+    n = len(q_chunks)
+
+    # Phase 1 — questions
+    raw_questions: list[dict] = []
+    for i, (sp, ep) in enumerate(q_chunks, 1):
+        push_step("ai", f"Phase 1 – Chunk {i}/{n}: pages {sp}–{ep} (questions)…")
+        chunk = vector_service.get_pages_text(document_id=document_id, start_page=sp, end_page=ep)
+        if not chunk:
+            continue
+        try:
+            qs = ai_service.extract_questions_no_answers(
+                _normalize(chunk), page_info=f"{sp}-{ep}", page_ref=sp,
+                model_id=model_id, api_key=api_key,
+            )
+            raw_questions.extend(qs)
+            push_step("ai", f"  Pages {sp}–{ep}: {len(qs)} questions. Total: {len(raw_questions)}.")
+        except Exception as e:
+            push_step("ai", f"  Pages {sp}–{ep} failed: {e}. Continuing…")
+
+    # Phase 2 — answer key
+    push_step("ai", f"Phase 2 – Answer key from pages {answer_section_start}–{section_end}…")
+    answer_key: dict = {}
+    for ans_start in range(answer_section_start, section_end + 1, chunk_pages):
+        ans_end = min(ans_start + chunk_pages - 1, section_end)
+        ans_content = vector_service.get_pages_text(document_id=document_id,
+                                                     start_page=ans_start, end_page=ans_end)
+        if not ans_content:
+            continue
+        chunk_key = ai_service.extract_answer_key(
+            _normalize(ans_content), page_info=f"{ans_start}-{ans_end}",
+            model_id=model_id, api_key=api_key,
+        )
+        answer_key.update(chunk_key)
+        push_step("ai", f"  Answer pages {ans_start}–{ans_end}: +{len(chunk_key)}. Total: {len(answer_key)}.")
+
+    push_step("ai", f"Answer key complete: {len(answer_key)} items.")
+
+    # Phase 3 — match
+    push_step("ai", "Phase 3 – Matching questions to answers…")
+    valid: list[dict] = []
+    skipped: list[str] = []
+    for q in raw_questions:
+        item = q.get("item_number")
+        letter = answer_key.get(item) if item else None
+        if not letter:
+            skipped.append(q.get("question_text", "")[:120])
+            continue
+        options = q.get("options") or []
+        idx = ord(letter.upper()) - ord("A")
+        if 0 <= idx < len(options):
+            q["correct_answer"] = options[idx]
+            valid.append(q)
+        else:
+            skipped.append(q.get("question_text", "")[:120])
+
+    push_step("ai", f"Matching: {len(valid)} matched, {len(skipped)} unmatched.")
+    return valid, skipped
+
+
+# ─── REGEX MODE ──────────────────────────────────────────────────────────────
+
+REGEX_ANALYSIS_PROMPT = """Look at this PREP exam PDF content and identify the pattern used to mark correct answers.
+
+Describe:
+1. The exact text pattern before the correct answer letter (e.g. "Correct Answer:" or "Preferred Response:")
+2. Whether answers appear right after each question (inline) or in a separate section at the back
+3. A Python regex pattern that would match: the answer indicator + whitespace + the letter (A-E)
+
+Return ONLY JSON:
+{{"indicator": "<text before letter>",
+ "placement": "inline" | "end_of_doc",
+ "regex": "<python regex with one capture group for the letter>",
+ "notes": "<any relevant observation>"}}
+
+Sample content (first 30 pages):
+{content}"""
+
+
+def extract_with_regex(
+    document_id: int,
+    section_start: int,
+    section_end: int,
+    model_id: str | None,
+    api_key: str | None,
+    push_step,
+    chunk_pages: int = 50,
+) -> tuple[list[dict], list[str]]:
+    """AI analyses format, generates regex for answer extraction, then applies it."""
+    # Sample first 30 pages for analysis
+    push_step("ai", "Regex mode: analysing document format…")
+    sample = vector_service.get_pages_text(document_id=document_id,
+                                            start_page=section_start,
+                                            end_page=min(section_start + 29, section_end))
+    if not sample:
+        raise ValueError("No content found for format analysis")
+
+    prompt = REGEX_ANALYSIS_PROMPT.format(content=_normalize(sample)[:60000])
+    analysis_text = ai_service._call_model(prompt, model_id, api_key).strip()
+    if analysis_text.startswith("```"):
+        analysis_text = analysis_text.split("\n", 1)[1] if "\n" in analysis_text else analysis_text[3:]
+        if analysis_text.endswith("```"): analysis_text = analysis_text[:-3]
+
+    analysis = json.loads(analysis_text.strip())
+    regex_pattern = analysis.get("regex", r"(?:Correct Answer|Preferred Response)\s*[:\.]?\s*([A-E])")
+    placement = analysis.get("placement", "inline")
+    push_step("ai", f"Format detected: {placement} answers. Indicator: {analysis.get('indicator','?')!r}. Regex: {regex_pattern!r}")
+
+    # Extract questions using standard no-answer prompt
+    push_step("ai", "Extracting questions…")
+    q_end = section_end
+    if placement == "end_of_doc":
+        # Try to find boundary
+        for scan_p in range(section_start + 20, section_end, 10):
+            raw = vector_service.get_pages_text(document_id=document_id, start_page=scan_p,
+                                                 end_page=min(scan_p + 9, section_end))
+            if raw:
+                norm = _normalize(raw)
+                try:
+                    if re.search(regex_pattern, norm, re.IGNORECASE):
+                        q_end = max(section_start, scan_p - 5)
+                        break
+                except re.error:
+                    break
+
+    raw_questions: list[dict] = []
+    q_chunks = []
+    p = section_start
+    while p <= q_end:
+        q_chunks.append((p, min(p + chunk_pages - 1, q_end)))
+        p += chunk_pages
+
+    for i, (sp, ep) in enumerate(q_chunks, 1):
+        push_step("ai", f"Questions chunk {i}/{len(q_chunks)}: pages {sp}–{ep}…")
+        chunk = vector_service.get_pages_text(document_id=document_id, start_page=sp, end_page=ep)
+        if not chunk:
+            continue
+        try:
+            qs = ai_service.extract_questions_no_answers(
+                _normalize(chunk), page_info=f"{sp}-{ep}", page_ref=sp,
+                model_id=model_id, api_key=api_key,
+            )
+            raw_questions.extend(qs)
+        except Exception as e:
+            push_step("ai", f"  Chunk {i} failed: {e}")
+
+    push_step("ai", f"{len(raw_questions)} questions extracted. Applying regex to full document for answers…")
+
+    # Apply regex to full document to find item→letter mapping
+    answer_map: dict = {}
+    for ans_start in range(section_start, section_end + 1, chunk_pages):
+        ans_end = min(ans_start + chunk_pages - 1, section_end)
+        ans_content = vector_service.get_pages_text(document_id=document_id,
+                                                     start_page=ans_start, end_page=ans_end)
+        if not ans_content:
+            continue
+        norm = _normalize(ans_content)
+        # Find Item NNN + answer pattern
+        combined = r"Item\s+(\d+)[\s\S]{0,300}?" + regex_pattern
+        try:
+            for m in re.finditer(combined, norm, re.IGNORECASE):
+                item_num = m.group(1).lstrip("0") or m.group(1)
+                letter = m.group(2).upper() if len(m.groups()) > 1 else ""
+                if letter:
+                    answer_map[item_num] = letter
+        except re.error:
+            pass
+
+    push_step("ai", f"Regex found {len(answer_map)} item→answer mappings.")
+
+    # Match
+    valid: list[dict] = []
+    skipped: list[str] = []
+    for q in raw_questions:
+        item = q.get("item_number")
+        letter = answer_map.get(item) if item else None
+        if not letter:
+            skipped.append(q.get("question_text", "")[:120])
+            continue
+        options = q.get("options") or []
+        idx = ord(letter.upper()) - ord("A")
+        if 0 <= idx < len(options):
+            q["correct_answer"] = options[idx]
+            valid.append(q)
+        else:
+            skipped.append(q.get("question_text", "")[:120])
+
+    push_step("ai", f"Matched {len(valid)}, skipped {len(skipped)}.")
+    return valid, skipped
+
+
+# ─── AI DECIDES ──────────────────────────────────────────────────────────────
+
+AI_DECIDE_PROMPT = """You are analysing a PREP medical exam PDF to determine the best extraction strategy.
+
+Sample from first 30 pages:
+{sample_start}
+
+---
+Sample from last 20 pages:
+{sample_end}
+
+Based on these samples, which extraction strategy should be used?
+
+1. standard      — "Correct Answer: X" or "Preferred Response: X" appears right after each question
+2. two_step      — questions come first (no answers), then a separate answer key section at the back
+3. questions_only — no answer indicators at all (answers unknown)
+
+Return ONLY JSON:
+{{"strategy": "standard" | "two_step" | "questions_only",
+ "reasoning": "<one sentence>"}}"""
+
+
+def ai_decide_strategy(
+    document_id: int,
+    section_start: int,
+    section_end: int,
+    model_id: str | None,
+    api_key: str | None,
+) -> str:
+    """AI reads samples from start and end of document and decides extraction strategy."""
+    sample_start = vector_service.get_pages_text(document_id=document_id,
+                                                   start_page=section_start,
+                                                   end_page=min(section_start + 29, section_end))
+    sample_end = vector_service.get_pages_text(document_id=document_id,
+                                                start_page=max(section_start, section_end - 19),
+                                                end_page=section_end)
+    prompt = AI_DECIDE_PROMPT.format(
+        sample_start=_normalize(sample_start or "")[:30000],
+        sample_end=_normalize(sample_end or "")[:20000],
+    )
+    try:
+        text = ai_service._call_model(prompt, model_id, api_key).strip()
+        if text.startswith("```"):
+            text = text.split("\n", 1)[1] if "\n" in text else text[3:]
+            if text.endswith("```"): text = text[:-3]
+        result = json.loads(text.strip())
+        strategy = result.get("strategy", "standard")
+        reasoning = result.get("reasoning", "")
+        logger.info(f"AI decided: {strategy} — {reasoning}")
+        return strategy, reasoning
+    except Exception as e:
+        logger.warning(f"ai_decide failed: {e}, falling back to standard")
+        return "standard", "Fallback to standard due to analysis error"

backend/app/tasks/quiz_tasks.py

@@ -47,6 +47,7 @@ def extract_quiz(
     time_limit_minutes: int | None,
     model_id: str | None,
     question_category_id: int | None,
+    extraction_mode: str = "standard",
 ):
     r = _redis()
     r.set(f"extraction:status:{job_id}", "running", ex=EXPIRE_SECONDS)
@@ -103,36 +104,92 @@ def extract_quiz(
         all_valid_questions = []
         all_skipped = []
 
-        for chunk_idx, (start_p, end_p) in enumerate(chunks, 1):
-            if n_chunks > 1:
-                _push_step(r, job_id, "ai", f"Chunk {chunk_idx}/{n_chunks}: pages {start_p}–{end_p} → {model_name}…")
-            else:
-                _push_step(r, job_id, "ai", f"Sending pages {start_p}–{end_p} to {model_name}…")
-
-            chunk_content = vector_service.get_pages_text(
-                document_id=section.document_id, start_page=start_p, end_page=end_p,
+        # ── Non-standard extraction modes ─────────────────────────────────────
+        if extraction_mode != "standard":
+            from app.services.extraction_modes import (
+                extract_questions_only, extract_two_step,
+                extract_with_regex, ai_decide_strategy,
             )
-            if not chunk_content:
-                _push_step(r, job_id, "ai", f"  No text found for pages {start_p}–{end_p}, skipping.")
-                continue
-            try:
-                chunk_data = ai_service.extract_questions(
-                    _normalize_ocr(chunk_content),
-                    page_info=f"{start_p}-{end_p}",
-                    page_ref=start_p,
-                    model_id=model_id,
-                    api_key=api_key,
+
+            resolved_mode = extraction_mode
+
+            if extraction_mode == "ai_decide":
+                _push_step(r, job_id, "ai", "AI is analysing the document to choose the best strategy…")
+                resolved_mode, reasoning = ai_decide_strategy(
+                    section.document_id, section.start_page, section.end_page,
+                    model_id, api_key,
                 )
-                chunk_skipped = chunk_data[0].pop("skipped", []) if chunk_data else []
-                chunk_valid = [q for q in chunk_data if q.get("correct_answer")]
-                all_valid_questions.extend(chunk_valid)
-                all_skipped.extend(chunk_skipped)
-                _push_step(r, job_id, "ai",
-                           f"  Pages {start_p}–{end_p}: {len(chunk_valid)} questions"
-                           f"{f', {len(chunk_skipped)} skipped' if chunk_skipped else ''}. "
-                           f"Total: {len(all_valid_questions)}.")
-            except Exception as e:
-                _push_step(r, job_id, "ai", f"  Pages {start_p}–{end_p} failed: {e}. Continuing…")
+                _push_step(r, job_id, "ai", f"AI chose: {resolved_mode} — {reasoning}")
+
+            if resolved_mode == "questions_only":
+                _push_step(r, job_id, "ai", "Mode: Questions Only — extracting questions without answers.")
+                for chunk_idx, (start_p, end_p) in enumerate(chunks, 1):
+                    _push_step(r, job_id, "ai", f"Chunk {chunk_idx}/{n_chunks}: pages {start_p}–{end_p}…")
+                    chunk_content = vector_service.get_pages_text(
+                        document_id=section.document_id, start_page=start_p, end_page=end_p)
+                    if not chunk_content:
+                        continue
+                    try:
+                        qs = extract_questions_only(_normalize_ocr(chunk_content),
+                            f"{start_p}-{end_p}", start_p, model_id, api_key)
+                        all_valid_questions.extend(qs)
+                        _push_step(r, job_id, "ai", f"  Pages {start_p}–{end_p}: {len(qs)} questions. Total: {len(all_valid_questions)}.")
+                    except Exception as e:
+                        _push_step(r, job_id, "ai", f"  Pages {start_p}–{end_p} failed: {e}")
+
+            elif resolved_mode == "two_step":
+                _push_step(r, job_id, "ai", "Mode: Two-Step (separate answer key section).")
+                all_valid_questions, all_skipped = extract_two_step(
+                    section.document_id, section.start_page, section.end_page,
+                    model_id, api_key,
+                    push_step=lambda step, msg: _push_step(r, job_id, step, msg),
+                    chunk_pages=CHUNK_PAGES,
+                )
+
+            elif resolved_mode == "regex":
+                _push_step(r, job_id, "ai", "Mode: AI+Regex — analysing format then applying regex.")
+                all_valid_questions, all_skipped = extract_with_regex(
+                    section.document_id, section.start_page, section.end_page,
+                    model_id, api_key,
+                    push_step=lambda step, msg: _push_step(r, job_id, step, msg),
+                    chunk_pages=CHUNK_PAGES,
+                )
+
+            else:
+                # ai_decide resolved to standard — fall through to standard loop below
+                extraction_mode = "standard"
+
+        if extraction_mode == "standard":
+            # ── STANDARD: existing working extraction (unchanged) ──────────────
+            for chunk_idx, (start_p, end_p) in enumerate(chunks, 1):
+                if n_chunks > 1:
+                    _push_step(r, job_id, "ai", f"Chunk {chunk_idx}/{n_chunks}: pages {start_p}–{end_p} → {model_name}…")
+                else:
+                    _push_step(r, job_id, "ai", f"Sending pages {start_p}–{end_p} to {model_name}…")
+                chunk_content = vector_service.get_pages_text(
+                    document_id=section.document_id, start_page=start_p, end_page=end_p,
+                )
+                if not chunk_content:
+                    _push_step(r, job_id, "ai", f"  No text found for pages {start_p}–{end_p}, skipping.")
+                    continue
+                try:
+                    chunk_data = ai_service.extract_questions(
+                        _normalize_ocr(chunk_content),
+                        page_info=f"{start_p}-{end_p}",
+                        page_ref=start_p,
+                        model_id=model_id,
+                        api_key=api_key,
+                    )
+                    chunk_skipped = chunk_data[0].pop("skipped", []) if chunk_data else []
+                    chunk_valid = [q for q in chunk_data if q.get("correct_answer")]
+                    all_valid_questions.extend(chunk_valid)
+                    all_skipped.extend(chunk_skipped)
+                    _push_step(r, job_id, "ai",
+                               f"  Pages {start_p}–{end_p}: {len(chunk_valid)} questions"
+                               f"{f', {len(chunk_skipped)} skipped' if chunk_skipped else ''}. "
+                               f"Total: {len(all_valid_questions)}.")
+                except Exception as e:
+                    _push_step(r, job_id, "ai", f"  Pages {start_p}–{end_p} failed: {e}. Continuing…")
 
         valid_questions = all_valid_questions
         skipped = all_skipped

frontend/src/pages/DocumentDetailPage.jsx

@@ -118,6 +118,7 @@ export default function DocumentDetailPage() {
   const [timeLimitMinutes, setTimeLimitMinutes] = useState('')
   const [selectedModelId, setSelectedModelId] = useState('')
   const [availableModels, setAvailableModels] = useState([])
+  const [extractionMode, setExtractionMode] = useState('standard')
   const [questionCategories, setQuestionCategories] = useState([])
   const [selectedQuestionCategoryId, setSelectedQuestionCategoryId] = useState('')
   const [newCatInline, setNewCatInline] = useState('')
@@ -186,6 +187,7 @@ export default function DocumentDetailPage() {
         time_limit_minutes: quizMode === 'timed' && timeLimitMinutes ? parseInt(timeLimitMinutes) : null,
         model_id: selectedModelId || null,
         question_category_id: selectedQuestionCategoryId ? parseInt(selectedQuestionCategoryId) : null,
+        extraction_mode: extractionMode,
       })
       // Async: show progress panel
       if (res.data.job_id) {
@@ -358,6 +360,23 @@ export default function DocumentDetailPage() {
                           placeholder="Leave blank for no limit" />
                       </div>
                     )}
+                    <div className="form-group">
+                      <label>Extraction Mode</label>
+                      <select value={extractionMode} onChange={e => setExtractionMode(e.target.value)}>
+                        <option value="standard">Standard — inline answers (Correct Answer / Preferred Response)</option>
+                        <option value="questions_only">Questions Only — no answers (fill in manually later)</option>
+                        <option value="two_step">Two-Step — separate answer key section (PREP 2013 style)</option>
+                        <option value="regex">AI + Regex — AI analyses format then applies regex for answers</option>
+                        <option value="ai_decide">AI Decides — AI reads the document and picks best strategy</option>
+                      </select>
+                      <p style={{ fontSize: '0.75rem', color: 'var(--text-subtle)', marginTop: 4 }}>
+                        {extractionMode === 'standard' && 'Best for PREP 2012, 2014 and most PDFs with answers inline.'}
+                        {extractionMode === 'questions_only' && 'Extracts questions + options only. Answer each question manually in Edit mode.'}
+                        {extractionMode === 'two_step' && 'For PDFs where all questions come first, then all answers at the back (PREP 2013 style).'}
+                        {extractionMode === 'regex' && 'AI detects the answer pattern, then uses regex for fast reliable extraction.'}
+                        {extractionMode === 'ai_decide' && 'AI samples the document and automatically picks the right strategy.'}
+                      </p>
+                    </div>
                     {availableModels.length > 1 && (
                       <div className="form-group">
                         <label>Extraction Model</label>

frontend/src/pages/QuizPage.jsx

@@ -232,6 +232,7 @@ useEffect(() => {
         answers,
         current_idx: currentIdx,
         mode: quizMode,
+        voice: selectedVoice || null,
       }).catch(() => {})
     }, 1500) // debounce 1.5s
     return () => clearTimeout(saveProgressRef.current)
@@ -265,16 +266,27 @@ useEffect(() => {
 
   if (loading) return <div className="loading"><div className="spinner"></div> Loading quiz...</div>
   if (!quiz) return null
-  const resumeQuiz = (saved) => {
+  const resumeQuiz = async (saved) => {
     const mode = saved.mode || saved.quizMode
-    setQuizMode(mode)
-    setAnswers(saved.answers || {})
-    setCurrentIdx(saved.current_idx ?? saved.currentIdx ?? 0)
-    setAttemptId(saved.attempt_id || saved.attemptId)
-    hasStarted.current = true
+    const savedIdx = saved.current_idx ?? saved.currentIdx ?? 0
+    // Restore answers — ensure string keys (Redis JSON returns strings)
+    const savedAnswers = saved.answers || {}
+
+    // For study mode, load quiz with correct answers BEFORE showing
     if (mode === 'study') {
-      api.get(`/quizzes/${id}?study=true`).then(r => setQuiz(r.data)).catch(() => {})
+      try {
+        const quizRes = await api.get(`/quizzes/${id}?study=true`)
+        setQuiz(quizRes.data)
+      } catch { }
     }
+
+    hasStarted.current = true
+    setQuizMode(mode)
+    setAnswers(savedAnswers)
+    setCurrentIdx(savedIdx)
+    setAttemptId(saved.attempt_id || saved.attemptId)
+    // Restore voice if saved
+    if (saved.voice) setSelectedVoice(saved.voice)
   }
 
   if (!quizMode) return (

frontend/src/pages/SettingsPage.jsx

@@ -219,7 +219,7 @@ export default function SettingsPage() {
       </div>
       <ProfileSection user={user} />
       <AppearanceSection />
-      <NextcloudSection />
+      {isModerator && <NextcloudSection />}
       {(isAdmin || isModerator) && <AdminSection />}
     </div>
   )