IGCSE Timeline: When to Start Preparing and Key Dates You Need

Two years sounds generous. It isn't.

The IGCSE programme runs for roughly 22 months from the first lesson to the final exam paper. That sounds like plenty of time until you subtract school holidays, mock exam weeks, coursework deadlines, and the inevitable slow start as students adjust to IGCSE-level content. Knowing the key dates, and building your preparation around them, is what separates students who feel in control from those who spend the last month in damage-limitation mode.

This timeline covers both Cambridge exam sessions (May/June and October/November), the milestones in between, and the decisions you'll need to make at each stage. Dates shift slightly each year, so treat these as reference windows rather than fixed points. Cambridge publishes the exact timetable for each session on its website roughly 12 months in advance.

The two exam sessions: May/June vs October/November

Cambridge offers IGCSE exams in two annual windows. The session you sit determines every deadline that follows.

Most students worldwide sit the May/June session. The October/November session is used primarily by schools in the southern hemisphere (where the academic year ends around November) and by students re-sitting after a disappointing result in June.

The 24-month timeline: month by month

Below is a reference timeline for a student following the standard two-year IGCSE programme leading to the May/June exam session. If you're sitting October/November, shift the entire sequence by approximately five months.

Year 1: building the foundation (September to July)

Year 2: acceleration and exam preparation (September to June)

Mock exams: the rehearsal that counts

Most schools schedule mock exams between November and January of Year 2. Some run a second set in March. Mocks serve three purposes that no other form of revision can replicate.

1. Timing calibration. You discover whether you can finish a paper in the allotted time. Many students first encounter time pressure during mocks, which gives them months to adjust their approach before the real exam.
2. Weak-topic identification. A mock result broken down by topic is more diagnostic than any self-assessment. If you scored 4/12 on the electrochemistry section of Chemistry Paper 4, that tells you exactly where to focus.
3. Exam-day simulation. The physical experience of sitting in a hall, managing silence, handling nerves, and writing under pressure is a skill. Students who have practised it perform better when the stakes are real.

If your school does not run formal mocks, create your own. Download a full past paper, set a timer, turn off your phone, and work through it in one sitting. Mark it using the official mark scheme afterwards. The discipline of doing this honestly is more valuable than any textbook chapter.

Results day and what follows

For the May/June session, Cambridge releases results in mid-August. Schools receive them a day or two before students. The exact date varies by year and is published on the Cambridge International website by the start of the calendar year.

If results are good

Confirm your next steps. If you're progressing to A-Levels or the IB Diploma, check that your grades meet the entry requirements for your chosen subjects. Some sixth forms require a minimum of B (or 6) in the IGCSE subject to continue at A-Level.

If results are disappointing

You have two immediate options.

• Enquiry About Results (EAR). This is Cambridge's re-marking service. You can request a clerical check (verifying marks were totalled correctly), a review of marking (a senior examiner re-marks your paper), or a review of moderation (for coursework). EAR must be submitted through your school or exam centre within a few weeks of results day. There is a fee, which is refunded if your grade changes.
• Re-sit. You can re-take the exam in the next available session (October/November for June candidates, or the following May/June). Re-sits are a fresh attempt. You sit the full paper again, and your new result replaces the old one on your certificate.

Early entry: should you sit exams ahead of schedule?

Some students, particularly in Mathematics or First Language English, complete the IGCSE syllabus before the standard timeline and sit the exam a year early (at the end of Year 1 rather than Year 2). This is sometimes called early entry.

The logic is straightforward: if the content is covered and the student is performing at target grade, an early entry frees up a slot in the Year 2 timetable for Additional Mathematics or another subject. There are conditions to consider, however.

• The grade must be strong enough to stand. An early B in Mathematics is less useful than a Year 2 A* if the student plans to take A-Level Maths. Some students sit early and then re-sit in Year 2 to improve, which doubles the exam cost and the pressure.
• Not all schools allow it. Early entry policies vary. Some schools encourage it for top-set students; others prohibit it to keep cohorts together.
• University applications typically see the final grade. An early entry doesn't carry extra credit. What matters is the result, not when it was achieved.

The decision should be driven by evidence, not ambition. If mock results and class assessments consistently show performance at or above the target grade, early entry is a reasonable option. If performance is borderline, the extra months of preparation in Year 2 are almost always worth more than the freed timetable slot.

Pacing revision across two years

The most common mistake in IGCSE preparation is treating revision as something that happens in the last three months. It doesn't work that way. The syllabus is too broad and the number of subjects too high for a late-stage blitz to cover everything at the depth examiners expect.

A more effective model spreads revision across the full programme in three phases.

1. Phase 1: concurrent review (Year 1, ongoing). As each topic is taught, make condensed revision notes the same week. Test yourself on those notes the following week. This takes 15 to 20 minutes per subject per week and prevents the content from becoming unfamiliar by the time exams arrive.
2. Phase 2: structured practice (Year 2, September to February). Shift from notes to past paper questions. Work topic by topic at first, then move to full papers as your confidence grows. Track your scores and identify recurring mistakes.
3. Phase 3: exam simulation (Year 2, March to exam day). Full papers under timed conditions. Mark using the official mark scheme. Focus revision time on topics where you're losing the most marks. At this stage, breadth matters less than precision on your weak areas.

A checklist of critical dates

Pin this somewhere visible. The exact dates change each year, but the sequence and approximate windows remain consistent.

• 12 months before exams: Cambridge publishes the exam timetable for the upcoming session.
• 8-9 months before exams: School registration window opens. Confirm subjects and tiers.
• 6-7 months before exams: Private candidate registration deadline (check your centre).
• 4-5 months before exams: Mock exams. Analyse results by topic.
• 3 months before exams: Final teaching concludes. Full-time revision begins.
• 6-8 weeks: Exam period (late April to mid-June for May/June session).
• Results day: Mid-August (May/June) or mid-January (October/November).
• EAR deadline: 2-3 weeks after results day.
• Re-sit registration: Opens shortly after results; deadlines vary by centre.

Every deadline in this list has a consequence for missing it. Registration deadlines in particular are hard cut-offs. Late entries, where centres accept them at all, carry significant surcharges and are not guaranteed.

The IGCSE timeline rewards students who plan early and adjust as they go. The syllabus is manageable, the exam format is predictable, and the deadlines are published well in advance. What separates strong outcomes from mediocre ones is not ability or luck. It's whether you used the 22 months you were given or only the last three.