IGCSE Explained: Subjects, Grading 9–1, and Preparation
The world's most portable 16+ qualification: subject families, Extended vs Core tiers, command words, and a four-layer prep system for the May–June paper marathon.
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The IGCSE (International General Certificate of Secondary Education) is the world's most widely taken international qualification for 14–16 year olds — offered by Cambridge (CAIE) and Edexcel, taken in over 150 countries, and accepted as the school-leaving certificate or university foundation entry point almost everywhere. For international families, it's often the first exam system a child encounters where subject choice and exam board strategy genuinely matter. This guide covers how it works and how to prepare for it well.
IGCSE grades run 9–1 (9 highest) in the current English system, or A–G on some boards and international scripts.* The "good pass" benchmark is grade 5–6; selective sixth forms and universities typically want 6–9s in relevant subjects, and medical routes usually demand 9s or A*s in sciences and maths. Grading is criterion-referenced, not curved — a fixed standard, not a race against classmates.
How the System Is Structured
IGCSE is subject-by-subject. There is no aggregate score and no compulsory combination — schools design the mix, typically 7–10 subjects:
- Near-universal: English Language, Mathematics, at least one Science, one Language
- Common additions: English Literature, Additional Mathematics, History/Geography, Economics, Business, Computer Science, Art & Design, a second language
- Extended vs Core tiers (Cambridge): Core targets grades 1–5, Extended targets 3–9. Taking Core caps the maximum grade — check which tier your child is entered for before it's too late to switch.
Two boards dominate: Cambridge (CAIE) and Edexcel (Pearson). Content overlaps heavily, but paper styles differ — Cambridge leans more to structured written answers, Edexcel to some multiple-choice and short-response formats. Past papers are board-specific; practising the wrong board's papers builds false confidence.
What Each Subject Family Actually Rewards
| Family | What the Exam Pays For | The Habitual Leak |
|---|---|---|
| Maths / Add Maths | Method accuracy + showing working | Skipped steps ("I did it in my head") — method marks are half the paper |
| Sciences (Bio/Chem/Phys) | Command-word answers, data handling | Describing when asked to explain; ignoring the practical-skills paper |
| English Language | Text analysis + controlled writing | Summary answers that copy rather than synthesise |
| Humanities (Hist/Geog/Econ) | Case study application, essay structure | Pre-learned essays that ignore the actual question stem |
| Languages | Reading/listening precision + speaking structure | Never rehearsing the speaking format until the week before |
The universal thread: command words ("state", "describe", "explain", "evaluate", "to what extent"). Each has a defined expectation in the mark scheme, and most grade losses across all subjects are answers with correct knowledge answering the wrong command.
A Preparation System That Fits 8 Subjects
- Past papers early, not late. The caricature says revise content for a year, then practise papers in the final month. Reverse it: from six months out, one timed past-paper section per subject per week. Papers reveal which content actually needs revising.
- Mark-scheme literacy. Students should read actual mark schemes — not model answers — to see how points are awarded. Learning the 3-mark structure of an "explain" question is content-free grade improvement.
- Spaced repetition for the recall-heavy subjects. Sciences and Humanities have real memorisation loads; spaced flashcards (definition → keyword → example) beat re-reading notes for retention.
- Track papers per subject, not feelings. A simple grid: subject, paper, date, score, top-two error types. Patterns emerge by week four and direct the next week's revision.
The exam-window reality: IGCSEs cluster in May–June (a resit window exists in Oct–Nov and Jan for some boards). A student sitting 8 subjects faces 15–20 papers in six weeks. Stamina — full-paper timed practice under exam conditions — is itself a preparation item, not an afterthought.
Studying for IGCSEs? Purply tutors support the full Cambridge and Edexcel subject range — from maths and sciences through to English, economics and computer science — with past-paper coaching against real mark schemes.
Frequently Asked Questions
IGCSE or GCSE — which is harder? The content is broadly comparable; IGCSE was historically considered slightly more exam-focused (less coursework), but the current GCSE has moved the same way. Universities treat them as equivalent. Choose by school and board, not difficulty rumours.
How many IGCSEs should a student take? 7–9 is standard. Beyond 9, marginal subjects dilute revision time for the ones universities actually check (maths, English, sciences for most routes). Depth in relevant subjects beats a long certificate.
Can IGCSEs get you into university directly? No — they're the mid-school qualification. Universities admit on A-Level/IB/diploma results; IGCSEs set the foundation and are checked for baseline competence in key subjects.
When should revision start? Structured revision from January for May–June exams (about four months out) is the evidence-backed window — early enough for spaced repetition, late enough to still be in syllabus flow. Starting in March compresses eight subjects into panic.
| Command Word | What the Examiner Wants | Common Wrong Answer |
|---|---|---|
State / Name | A bare fact, one line | A paragraph when one word earns the mark |
Describe | What happens, in order | Why it happens (that is explain) |
Explain | Mechanism: why / how it happens | A description with no causal link |
Evaluate / Discuss | Balanced judgement with criteria | One-sided knowledge dump |
IGCSEs Reward Technique, Not Just Knowledge
Most IGCSE grade losses are correct knowledge answering the wrong command word, or unrehearsed exam stamina across 15–20 papers in six weeks. Purply tutors the full Cambridge and Edexcel subject range with past-paper coaching against real mark schemes.
If you're struggling with:
- Your child knows the content but grades do not reflect it
- Extended vs Core tier decisions are looming
- The May–June window has 8 subjects and no plan
- Science papers lose marks on practical-skills questions
Here's how we'd coach you through it:
Send us your draft or your question. We'll walk you through:
- Cambridge and Edexcel subject tutoring across maths, sciences, English, economics, CS
- Past-paper coaching with mark-scheme answer training
- Command-word drills per subject family
- Full exam-window planning with stamina simulations