How to Self-Mark IGCSE Past Papers Using the Mark Scheme

To self-mark an IGCSE answer with the mark scheme, finish the question first, then go through the scheme line by line and award each mark only when your working shows exactly what that line asks for. Apply the scheme's own rules (method before accuracy, units, follow-through, "correct answer only") and record why every lost mark was lost.

This guide covers the routine. For a glossary of the letters on a mark scheme, read IGCSE mark schemes explained first.

Before you mark: get the right scheme

Cambridge sets several variants of most papers in each session, for example 0580/41, 0580/42 and 0580/43. Each variant has its own mark scheme, and using the wrong one gives you a wrong score. Check that the code on the scheme matches the code on the question paper, including the session (March, May/June or October/November). In the PapaMarks past papers library each paper is paired with its own scheme, so this check is done for you.

The self-marking routine

1. Finish the question, or the whole paper, before looking
   Peeking after one part changes how you answer the next one. If you are practising by topic, finish the set first.
2. Mark in a different colour
   Your original answer stays readable, so you can see later exactly what you wrote and what the scheme wanted.
3. Go mark by mark, not answer by answer
   For a 4-mark part, find the four marks in the scheme and decide each one separately. Most scores go up or down by a mark here because of a missing intermediate step or a missing unit.
4. Apply the scheme's rules strictly
   The rules are listed below by subject. When unsure, give yourself zero. An examiner who cannot see the method or the keyword will not award the mark.
5. Write the cause next to each lost mark
   Use short tags: METHOD, ROUNDING, UNIT, KEYWORD, MISREAD, TIME. Count the tags at the end of the week.
6. Rewrite the answer to full marks
   Copy the scheme's wording into your own full answer. Next time the same idea comes up, the right phrasing is already familiar.

Maths rules that decide marks (Cambridge 0580)

The general notes in the Cambridge 0580/42 mark scheme for May/June 2025 define three types of mark and nine abbreviations. These are the ones that change your score most often:

• M marks are for a valid method. A marks are for a correct answer or step, and an A mark is given only if its M mark was earned or implied. B marks stand alone.
• "dep" means a mark depends on an earlier one. If you didn't earn the first, you can't earn the second.
• FT (follow through after error) lets later marks stand when you correctly use your own wrong earlier answer.
• cao (correct answer only) means no follow-through and no near misses.
• awrt (answers which round to) means an answer that rounds to the scheme's value is accepted.
• nfww (not from wrong working) means a right answer reached through wrong working does not score.
• isw (ignore subsequent working) means a correct answer followed by extra working is not penalised; oe means "or equivalent"; soi means "seen or implied".

Accuracy is where self-markers are most generous. The 0580 syllabus asks for non-exact answers to 3 significant figures, or 1 decimal place for angles in degrees, unless the question says otherwise. If your answer was rounded too early and lands outside the accepted value, the A mark is gone even though the method was right.

Science rules that decide marks (Cambridge 0625 Physics)

The 0625/42 mark scheme for May/June 2025 sets out rules that apply across Cambridge IGCSE science papers:

• The final answer (A) mark needs a fully correct answer including the unit. Unless a separate mark is given for the unit, a missing or wrong unit normally loses the final calculation mark.
• A C mark is a compensatory mark that can be scored when the final A mark has not been awarded.
• An underlined word in the scheme, or a synonym, must appear in your answer. Technical terms must appear exactly.
• Words in brackets are not needed, but a contradictory word in their place loses the mark.
• Contradictions cancel. A correct point contradicted elsewhere in the same part earns nothing.
• The list rule: for "state two" questions, wrong answers still count towards the two. Writing four guesses doesn't help.
• owtte (or words to that effect) and ORA (or reverse argument) allow other wording, but the idea must be clear and unambiguous.

Edexcel rules (International GCSE Maths A, 4MA1)

Pearson's general marking guidance in the Summer 2026 4MA1/1H mark scheme adds two rules students often don't expect. A correct answer with no working normally scores full marks, but a wrong answer with no working, even a nearly correct one, scores nothing. If the working shows the correct answer was reached by incorrect working, the mark is zero. The abbreviations are similar to Cambridge's, plus "eeoo" (each error or omission). Our 4MA1 topic questions guide covers the paper itself.

Use examiner reports as a second opinion

Cambridge writes a principal examiner report for teachers after each series, describing how candidates answered each question and where they lost marks. Ask your teacher for the report that matches your paper. When your answer falls between two readings of the scheme, the examiner report for that paper often settles it. Your teacher can also re-mark a sample of your work; ask them to mark one question you were unsure about and compare.

Self-marking compared with other ways of getting marked

On PapaMarks Topical Questions for 0580, typed numerical answers are checked against the verified answer straight away, and the official scheme crop for that part is one click away. For parts like graphs or constructions you compare your work with the worked answer and pick your own mark, using the same rules as above. AI marking for written answers is explained, with its limits, in AI marking for IGCSE answers.

FAQ

Sources

• Cambridge IGCSE 0580/42 mark scheme, May/June 2025: mark types and abbreviations.
• Cambridge IGCSE 0625/42 mark scheme, May/June 2025: generic marking principles, list rule and shorthand.
• Pearson Edexcel International GCSE Mathematics A 4MA1/1H mark scheme, Summer 2026: general marking guidance.
• Cambridge International, Cambridge IGCSE Mathematics 0580 syllabus for 2025, 2026 and 2027: accuracy rules.