DM Triage & Technique Map

You now have a specific technique for every DM question type. This lesson pulls them together into a single decision system you can run on autopilot during the exam.

Green - always attempt first (highest marks per second)

• Recognising Assumptions (15-30s, 1 mark)
• Probabilistic Reasoning - simple (15-30s, 1 mark)
• Syllogisms with short, clear premises (45-60s, 2 marks)

Technique: Clause Extraction / Comparison Table / Arrow Method. These are mechanical processes with low ambiguity and the highest return on time.

Amber - attempt on second pass (good value with practice)

• Syllogisms with complex premises (60-90s, 2 marks)
• Interpreting Information (60-90s, 2 marks)
• Work-based Venn Diagrams (45-90s, 1-2 marks)
• Probabilistic Reasoning - combined events (45-60s, 1 mark)

Technique: Arrow Method / Claim-Check / Shape-to-Maths. Still systematic, but they need more processing time.

Red - skip on first pass (worst value per second)

• Logical Puzzles with 4+ variables (60-120s, 1 mark)
• Luck-based Venn Diagrams (90-150s, 1 mark)
• Any question with an impenetrable stimulus

Technique: Two-Way Table / check options against constraints. 1 mark for 2+ minutes of work. Guess, flag, return only with banked time.

These are the predictable DM traps. They show up across every mock and question bank. Know them in advance and you'll catch them on reflex.

Trap 1: Necessary vs. Sufficient Confusion (RA) - An answer that IS stated in the argument is a premise, not an assumption. The assumption is the unstated bridge between premises and conclusion. If it's written down, it's not hidden.

Trap 2: Reversal Error (Syllogisms) - "All A are B" does NOT mean "All B are A." The arrow is one-way. A -> B, not B -> A. This is the #1 tested trap in syllogisms. If a statement flips the subject and predicate of a premise, it's almost always No.

Trap 3: Overlap Double-Counting (Venn Diagrams) - The overlap region counts in BOTH circles. "15 do A, 12 do B, 5 do both" means A-or-B = 15 + 12 - 5 = 22, not 27. Always subtract the overlap when adding group totals.

Trap 4: Correlation vs. Causation (Interpreting Information) - The passage shows two things happening together. The statement says one CAUSES the other. Unless the passage explicitly states causation, the causal claim doesn't follow.

Trap 5: Not Reading All Options (Probabilistic Reasoning) - You calculate the answer, find it in option B, and select it. But you calculated MOST likely when the question asked LEAST likely. Always re-read the question after calculating.

The Timer Formula

Questions remaining × 1.06 = minutes you should have left. Simpler rule of thumb: slightly more than 1 minute per question.

If you have fewer minutes than questions, you're behind. Skip all Red questions, focus Green only.

Where Time Gets Banked

That banked time funds: Syllogisms (~5-6 sets at 90s = 450-540s) and II (~5-6 sets at 90s = 450-540s). The maths works: fast RA + PR funds thorough Syllogisms + II.

The Skip Decision

Spend 3 seconds on each new question:

Keep this in active memory throughout the DM section:

Key implications:

• Most → some (always true)
• Some ↛ most (not necessarily)
• Few → some (always true)
• Not all = some are not
• A ─all→ B does not give B ─all→ A

Before the section:

• Reset from VR. DM is logic, not scanning.
• Remind yourself: classify first, technique second.
• Have your whiteboard/notepaper ready for diagrams.

First pass (questions 1-35, moving forward):

1. Each question: classify in 2-3 seconds.
2. GREEN questions (RA + Probability): execute technique. Answer in 15-30 seconds. Bank the time saved.
3. AMBER questions (Syllogisms + II + work VD): draw the diagram or build your mental map. 60-90 seconds max. If stuck at 60s, make your best guess.
4. RED questions (LP + luck VD): spend max 30 seconds. Try plugging in options. If no quick answer, guess and flag.
5. Check timer at question 18 (midpoint):

Second pass (flagged questions, if time remains):

1. Return to flagged AMBER questions first (2 marks > 1 mark).
2. Then flagged RED questions if still time.

Last 2 minutes:

• Make sure EVERY question has an answer selected.
• No negative marking - never leave blank.
• For D&D you haven't attempted: guess all Yes or all No (any guess > blank).

D&D questions are worth 2 marks with partial credit. Getting 4/5 on a D&D set still earns 1 mark.

Answering 28 of 35 with high accuracy (including most D&D sets at 4/5 or 5/5) beats rushing all 35 with errors.

Phase 1: Untimed classification. Practise classifying question types and applying each technique in isolation. Don't worry about speed - build accuracy first.

Phase 2: Timed with triage. Enforce the triage system. RA + PR first, then Syllogisms + II, then LP + VD. Get used to flagging RED questions without guilt.

Phase 3: Full sections under timed conditions (37 minutes for 35 questions). Run the complete game plan end to end.

Phase 4: Error analysis. Review mistakes by category. Were they logic errors, time errors, quantifier definition errors, or classification errors? Each needs a different fix:

• Logic errors: rework the technique steps
• Time errors: triage more aggressively
• Quantifier errors: drill the UCAT definitions
• Classification errors: practise the 2-second type identification

Across the DM module, you've covered all 19 skills from the DM taxonomy:

Syllogisms (A1-A5): Quantifier reasoning, transitive deduction, converse error detection, multi-property classification, conditional reasoning with multiple constraints. All handled by the Arrow Method + hypothetical test.

Logical Puzzles (B1-B6): Constraint satisfaction, sequential ordering, scheduling/route planning, positional/spatial reasoning, algebraic deduction, resource exchange. All handled by the Two-Way Table + working backwards from options.

Venn Diagrams (C1-C5): Region identification, numerical calculation, construction from text, algebraic word problems, qualitative relationship reading. All handled by Shape-to-Maths + inside-out filling.

Interpreting Information (D1-D3): Scientific passage inference, numerical passage inference, graphical data interpretation. All handled by Claim-Check.

Probabilistic Reasoning (E1-E5): Basic probability calculation, misleading framing, combined probability, pigeonhole principle, expected value. All handled by the Comparison Table + complement rule + multiplication rule.

Recognising Assumptions (F1): Evaluating argument relevance and scope. Handled by Clause Extraction + Red Flag Elimination.

The two things that separate high scorers from everyone else in DM: (1) ruthless triage - spending time where the marks are, and (2) the UCAT quantifier definitions - knowing that "most" means >50% and "some" means >=2, not what they mean in everyday English.