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Section III · Topic guide

Reading graphs & data under pressure

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

A checklist for extracting the right information from figures fast — without the classic traps.

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

Free interactive lesson

Try the reasoning style

Section I · Humanities & Social SciencesIllustrative example

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.

Half of Section III is graphs and tables. The candidates who score well aren't faster readers — they read figures in the right order and sidestep a few predictable traps.

The number-one trap

Read the axes and units first — before the shape. A "big rise" on a log axis or a truncated axis can mean almost nothing. Most graph mistakes are really axis mistakes.

Solubility of a salt vs temperature

Read a value: at 40 °C about 64 g dissolves per 100 g of water.

Notice the curve gets steeper — solubility rises faster at higher temperatures. That changing gradient is often what a question is really asking about.

A 4-step figure checklist

1

Axes & units

What's plotted against what, in what units? Linear or log? Where does the axis start?

2

Overall trend

Up, down, peak, plateau? Is the gradient constant or changing?

3

The specific point

Go to the exact value the question asks for — don't eyeball the whole figure.

4

Trap check

Correlation isn't cause; an extrapolation beyond the data isn't supported; two y-axes can mislead.

Check yourself

From the solubility graph above, roughly how much extra salt dissolves per 100 g of water when you heat it from 20 °C to 60 °C?

Key takeaways

  • Axes and units before shape — most graph errors are axis errors.
  • Name the trend and whether the gradient is changing.
  • Jump to the exact value asked for; don't read the whole figure.
  • Watch for truncated axes, log scales, and unsupported extrapolation.

Practise this with real GAMSAT-style questions

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3 min read · Technique