How to Read a Mark Scheme Like an Examiner

Every year students lose marks not because they don't know the content, but because they answer the wrong question. Cambridge examiners mark to a scheme — and once you understand its language, you can write answers that hit every point.

Command words are instructions, not decoration. 'State' wants a fact. 'Describe' wants a sequence of features. 'Explain' wants a reason attached to each point — use because, so that, this means. If a question says 'explain' and you only 'describe', you will cap out at half marks.

Count the marks. A 4-mark 'explain' question almost always wants two points, each with a reason. A 6-mark question wants three. Write in numbered lines so the examiner can find your points.

'Any two from' means exactly two. Writing five points when two are asked does not earn extra credit, but it does waste time and can introduce a contradiction that loses you a mark.

Use the syllabus vocabulary. If the scheme says packet, interrupt, transitive dependency, then those words are what earn marks. Paraphrasing is risky. Learn the key terms on each topic page on this site — they are pulled straight from the syllabus.

Practise with the scheme open. Do a past paper question, then mark it yourself brutally with the scheme. Then re-answer it. This loop is the single most effective revision activity for Computer Science.