GAMSAT Section 3 tips: how to study, pace and estimate

In the standard calculation Section III counts twice towards your overall score, so a point gained here is worth twice a point in Section I or Section II. It’s also the section where structured study pays off most predictably: the content is finite and the question styles repeat.

If you’re new to the section, start with the Section 3 overview and free sample unit.

1. Find your baseline before you plan. Do a few untimed units across biology, chemistry and physics. Note which questions you got wrong because of content and which because of reasoning or arithmetic. Those need different fixes.
2. Build the foundations first. Ratios, powers of ten, logarithms, unit conversions and rearranging equations come up in almost every unit. So do moles, concentration, equilibrium and acids and bases. Get these fluent before going deep on any one subject.
3. Learn concepts, not facts. The exam gives you unfamiliar scenarios. Knowing why a buffer resists pH change, or why resistance rises with length, transfers to a new passage. A memorised list doesn’t.
4. Practise in exam format early. Section III questions come in units built around a shared passage, graph or table. Practising from stimuli, rather than from textbook questions alone, trains the reading as well as the science.
5. Review every mistake. For each miss, write one line on where your reasoning went wrong. Patterns appear quickly: misread axes, unit slips, a concept you half know.
6. Add timing last. Accuracy first, then speed. Once you’re getting most questions right untimed, start working to two minutes per question.

Calculators aren’t allowed, but the questions are designed for that. The numbers usually round cleanly and the options are often far enough apart that an estimate is enough.

• Work in scientific notation. Handle the significant figures and the powers of ten separately, then put them back together.
• Round early, and in opposite directions. If you round one number up, round another down to keep the estimate close.
• Know a few logarithms: log 2 ≈ 0.3, log 3 ≈ 0.48, log 5 ≈ 0.7. With these, pH and decibel questions become mental arithmetic.
• Check with units. If the units of your answer don’t match what the question asks for, the setup is wrong.
• Look at the options first for calculation questions. If they differ by factors of ten, you only need the order of magnitude.

Two quick examples:

(6.2 × 10⁻³ × 4.9 × 10⁵) ÷ 3.1 ≈ 2 × 5 × 10² = 1 × 10³

[H⁺] = 2 × 10⁻⁴ M, so pH = 4 − log 2 ≈ 4 − 0.3 = 3.7

• Read the axes before the data. Check the variable, the units and whether the scale is linear or logarithmic. Many wrong options come from misreading a log axis.
• Skim the passage, then go to the questions. You don’t need to understand every sentence of the stimulus. Find what each question needs and go back for it.
• Expect to be told the science. If a passage introduces an equation or a mechanism, the questions will use it. Trust the passage over what you remember.
• Watch for trend versus value. Some questions ask what happens to a quantity, others ask for its size. Reread the stem before choosing.

That’s two minutes per question on average, but the time won’t divide evenly. A short unit on familiar biology might take a minute a question; a dense physics unit might take three.

• Check your pace at each quarter. Around 19 questions every 37 or 38 minutes keeps you on track.
• Spot time sinks early. If you haven’t got a clear approach within a minute, rule out what you can, choose, flag it and move on.
• Answer everything. There’s no penalty for wrong answers, so a blank is always a lost mark.
• Bank the easy marks. Every question is worth the same. Don’t let a hard unit stop you reaching easier ones later.

Plenty of candidates come to Section III from the humanities, law, commerce or nursing. The content is learnable, and the reasoning skills you already have transfer.

1. Give yourself more time. Plan for several months of content study before full timed practice.
2. Follow a sequence. Maths, then general chemistry, then organic chemistry and biology, then physics. Each step makes the next easier.
3. Use short lessons and practise straight away.Learn a concept, then apply it in a question the same day. Get Into Med’s first 4 Learn syllabuses cover exactly these foundations and are free.
4. Don’t chase depth. First-year university biology and chemistry and final-year school physics are the target. You don’t need a degree’s worth of detail.

• Studying only content and leaving exam-format practice until late.
• Doing questions without reviewing why the wrong ones went wrong.
• Reaching for exact arithmetic when an estimate would do.
• Skipping organic chemistry because it feels like memorisation.
• Spending five minutes on one question and rushing the last unit.
• Relying on recall when the passage gives a different model.

Want to test yourself now? Try the free GAMSAT practice questions with worked explanations, or build a study plan for all three sections.