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Section III · Topic guide

Section III: reasoning, not recall

Section III — Sciences · a free, hand-written guide with worked reasoning and adaptive practice that finds your weak spots.

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The short answer

The single mindset shift that separates competitive Section III scores from the rest.

Written and checked by GAMSAT tutors — not AI-generated.

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Try the reasoning style

Section I · Humanities & Social SciencesSample question

We treat forgetting as a failure — a lapse to be patched with reminders and records. Yet a mind that kept everything could not think; it would drown in the undifferentiated noise of every moment it had ever lived. To forget is not so much to lose information as to decide, mostly without our noticing, what was never worth keeping.

The author's argument relies most directly on which unstated assumption?

Pick an option to see how the tutor reasons to the answer — not just whether you were right.

How to reason to the answer

Not quite — the answer is B.

Work backwards from the conclusion: a mind that ‘kept everything’ supposedly ‘could not think.’ That only follows if thinking means leaving most of experience out — so B is the premise the argument quietly rests on. A raises reliability, which the passage never weighs; C contradicts ‘mostly without our noticing’; D smuggles in a claim about intellect the passage never makes. The question rewards finding the hidden premise, not recalling a fact.

Most people prepare for Section III like a university exam — memorising facts and formulas. That is the wrong model, and it quietly caps your score. The science is only the context; the thing actually being tested is your reasoning.

Two ways to prepare

Memorising (caps your score)

  • Cramming facts, reactions and formulas
  • Panicking at unfamiliar content
  • Hunting for the 'remembered' answer
  • Relying on outside knowledge

Reasoning (what's rewarded)

  • Know the core, then interpret
  • Stay calm — new content is the point
  • Work the answer from the stimulus
  • Treat each stimulus as self-contained

If a question can be answered by recalling a fact, it is probably not a real GAMSAT question.

A reliable approach to every question

1

Read the question stem first

Know what you are hunting for before you wade into the stimulus.

2

Locate the specific part

Find the exact graph, line or value the question points to. Don't re-read everything.

3

Name the principle

Ask: what relationship is being tested — a trend, a trade-off, cause and effect?

4

Eliminate by error type

Cut options that misread the data, reverse a relationship, or are true-but-irrelevant.

Reasoning in action

A graph shows enzyme activity rising with temperature to a peak at 40 °C, then falling sharply. A question asks why activity drops after 40 °C — and you have never seen this enzyme. How do you answer?

Check yourself

A question gives you an unfamiliar reaction scheme and asks which step is rate-limiting. You have never seen the reaction. The best first move is to:

Everything above was rehearsed on a sentence. The paper gives you a stimulus you have never seen and three or four questions hanging off it, and you have about 90 seconds each. Below is that shape. You are not expected to have met this organism — that is the point.

Passage· 3 questions on it

The following is adapted from a marine microbiology report. No prior knowledge of the organism is required.

Strain PN-4 was recovered from sediment at a depth of 2,600 m, where the pressure is about 26 MPa and the temperature is 4 °C. To find what governs its growth, cultures were raised in identical media and the DOUBLING TIME was measured — the time taken for the number of cells to double. A shorter doubling time means faster growth. In the first series the temperature was held at 4 °C and the pressure was varied. In the second the pressure was held at 26 MPa and the temperature was varied. Series 1 — pressure varied, temperature held at 4 °C:
Pressure (MPa)Doubling time (h)
0.121.0
109.5
265.8
406.1
6014.2
Series 2 — temperature varied, pressure held at 26 MPa:
Temperature (°C)Doubling time (h)
27.9
45.8
84.6
129.8
16no growth in 96 h
A surface-water strain, SF-1, was run alongside as a control. At 0.1 MPa and 4 °C it doubled in 6.0 h; at 26 MPa and 4 °C it doubled in 44 h.

Q1 of 3 on this passage

Which conclusion about PN-4 is best supported by Series 1 on its own?

Q2 of 3 on this passage

A culture of PN-4 is held at 26 MPa and 8 °C and inoculated at 1.0 × 10⁶ cells per mL. Assuming it keeps doubling at the measured rate, roughly how many cells per mL are present after 18.4 hours?

Q3 of 3 on this passage

A student concludes from Series 2 that PN-4 cannot survive above 12 °C. The weakest part of that conclusion is that

Key takeaways

  • Section III tests reasoning; the science is just the context.
  • Every answer is supported by the stimulus in front of you.
  • Read the stem first, locate the evidence, name the principle, eliminate by error type.
  • Unfamiliar content is deliberate — stay calm and work from first principles.

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