IGCSE Maths past papers: a strategy that works for Cambridge and Edexcel

Know the papers before you practise

From the Cambridge 0580 syllabus for 2025, 2026 and 2027 and the Edexcel 4MA1 specification. Check the exam timetable pages for session dates.

The three phases

Phase 1, during the course: after each topic is taught, do every past-paper question on that topic you can find, untimed, with notes allowed at first and then without. This turns textbook understanding into exam-style fluency and shows how the board actually words its questions.

Phase 2, the last two or three months: full papers under exam conditions, in one sitting, with the right calculator rules. For Cambridge, pair a non-calculator paper with a calculator paper as in the real exam. Start with older papers and save the most recent series for the final weeks.

Phase 3, after every paper: mark it yourself with the official mark scheme, line by line, then record every lost mark in an error log with its cause. The log decides what you revise next. A paper that is done but not marked teaches almost nothing.

Mark schemes use codes. M marks are for method, A marks for accuracy and depend on the method, and B marks are independent. Knowing this explains why showing working matters: a correct method with an arithmetic slip still earns the M marks, while a bare wrong answer earns nothing.

Worked example 1: a time budget for a 2-hour, 100-mark paper

1. 120 minutes for 100 marks is 1.2 minutes per mark. Keep about 10 minutes back for checking, which leaves about 1.1 minutes per mark.
2. So a 6-mark question deserves about 6 to 7 minutes. If you have spent 12 minutes on it, mark where you are, move on, and come back at the end.
3. Checkpoint: after 55 minutes you should be roughly halfway through the marks, not the pages, since later questions are longer.
4. For Cambridge Core Papers 1 and 3 (90 minutes, 80 marks) the rate is about 1.1 minutes per mark before any checking time, so keep moving.

Worked example 2: how early rounding loses an accuracy mark

1. A sphere has surface area 200 cm^2. Find its volume. Cambridge expects 3 significant figures and no rounding until the final answer.
2. 4πr^2 = 200, so r^2 = 200 ÷ 4π and r = 3.98942... Keep this full value in the calculator.
3. V = (4/3)πr^3 = 265.96..., so V = 266 cm^3 (3 s.f.).
4. If r is rounded to 4.0 first, V = (4/3)π(64) = 268.08..., which gives 268 cm^3. The method mark survives, but the accuracy mark is lost.

Worked example 3: turning lost marks into a revision plan

1. After marking, list every lost mark with a cause: knowledge (did not know the topic), method (knew it but chose the wrong approach), accuracy (arithmetic, signs, rounding), reading (misread the question or units), or time (did not reach it).
2. Example log for one paper: knowledge 7 marks (vectors, histograms), method 5 (bounds), accuracy 8 (signs, early rounding), reading 3, time 4.
3. Knowledge and method losses go into the next week's topic practice. Accuracy losses call for a checking habit, such as substituting answers back or re-reading the question's required accuracy.
4. Reading losses are fixed by underlining command words and units. Time losses are fixed by the budget in example 1 and by doing the next paper in strict timed conditions.

Common mistakes with past papers

• Doing papers but only checking final answers, not the mark scheme's method points.
• Using a calculator on Cambridge non-calculator practice papers.
• Practising the wrong tier: Core and Extended, or Foundation and Higher, are different papers.
• Starting full timed papers too early, before topics have been covered, which mostly measures gaps.
• Using up all the most recent papers early, leaving none for a realistic final run.
• Treating grade boundaries from one series as fixed targets. Boundaries are set for each series and change.

Exam technique and how a tutor helps

On the day, read the formula page first, attempt every question in order but skip and return when stuck, show working for every multi-step answer, and give non-exact answers to 3 significant figures and angles to 1 decimal place on Cambridge papers unless told otherwise. Use π from the calculator or 3.142, as Cambridge specifies.

Cambridge says that if a question asks you to show working, you cannot gain full marks without it, even with the right answer. Edexcel questions often say 'show your working clearly'. Either way, the working is where the marks are.

A tutor adds the most value in phase 3. Marking a paper with a student, one to one, shows not just which answers are wrong but why, and patterns appear quickly: the same sign error, the same misread command word. The tutor then plans the following lessons around that error log, mixing targeted topic work with timed sections, which is a more efficient use of the final months than doing paper after paper alone.

Self-check before your next paper

• Do you know which papers, tier and board your child is entered for?
• Do you have the official mark schemes, not just answers?
• Is there an error log with a cause for each lost mark from the last paper?
• Can you state the time per mark for your papers? (Cambridge Extended and Edexcel: 1.2 minutes; Cambridge Core: about 1.1 minutes)
• Are the most recent papers saved for the final weeks?