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Which required practical steps do I get wrong?

Practicals

Required practical 1: Microscopy · Calculation

The image of a cheek cell is 12 mm long. The microscope magnification is ×400. What is the real length of the cell?

GCSE Science required practicals

Answer the first question

Revise the practicals you missed

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Questions people ask

How many required practicals are there in GCSE Combined Science?

21 for AQA Combined Science: Trilogy: 7 biology, 6 chemistry and 8 physics. AQA's separate sciences have 28.

How much of the exam is on required practicals?

AQA says at least 15% of the marks in its GCSE science papers assess the practical work.

Do I need to learn the methods?

Yes. Questions ask why a step is done, which variables to control, and how to process the results.

How we work this out

What it does

One exam-style question on each of the 21 required practicals: every wrong answer names the exact step you missed.

The 21 required practicals of AQA GCSE Combined Science: Trilogy (8464), which also appear in AQA's separate Biology, Chemistry and Physics.

Method

  1. Each practical has one original question on a variable, a method step, reading a graph, a calculation or an evaluation, written to that practical's specification point.
  2. Every wrong option was written to match one common slip, and the page names the reasoning step it misses.
  3. The answer counts what is right and lists the steps to fix, each with the lesson that teaches it.