When to Start IGCSE Chemistry Revision

The most common revision mistake for IGCSE Chemistry is starting too late. Students coast through Year 10, plan to “revise properly in Year 11,” and then discover that Year 11 is consumed by new topics, mock exams, other subjects, and the creeping realisation that the exam is closer than it feels. The opposite mistake — starting intense revision in Year 10 before the syllabus is taught — is rarer but also wasteful, because you cannot revise what has not been learned.

The right timing depends on your exam sitting, your school’s teaching schedule, and how much of the syllabus has been covered. Here is a practical timeline.

Year 10: Building the foundation (not revision yet)

Year 10 is not revision season. It is learning season. The goal is to understand each topic as it is taught and build the habits that make Year 11 revision efficient.

What to do in Year 10

Keep up with lessons. Every lesson is revision time saved later. A student who understands bonding and structure when it is taught does not need to relearn it from scratch in Year 11.

Start a flashcard deck. After each topic, add 10-15 flashcards for definitions, equations, and key facts. Review the deck weekly. By the end of Year 10, you have a deck of 100+ cards covering half the syllabus, and the earliest cards are already in long-term memory. See flashcard strategies.

Do end-of-topic questions. After each topic, attempt the questions at the end of the textbook chapter and mark them. This provides immediate feedback on whether the topic is understood.

Begin a glossary. Build a running list of chemistry vocabulary with precise definitions. This saves time later and trains you to use scientific language accurately.

What not to do in Year 10

Do not start full past papers. The syllabus is incomplete, so you will encounter questions on topics not yet taught. This is demoralising and wastes papers you should save for timed practice later.

Do not cram for end-of-year exams. Use the same study methods (active recall, flashcards) throughout the year. Cramming for Year 10 exams teaches a habit that will fail at IGCSE level.

Year 11, Term 1: Completing the syllabus and starting topic revision

Most Malaysian international schools complete the 0620 syllabus by the end of Year 11 Term 1 (around December for Oct/Nov candidates, or around September for May/Jun candidates). During this term:

As each new topic is taught

Follow the same Year 10 process: keep up with lessons, add flashcards, do end-of-topic questions. New Year 11 topics (often organic chemistry, chemical energetics, and some extended content) need the same foundational treatment.

Begin topic-based past paper questions

Once a topic is complete, start doing past paper questions on that topic. Sort questions by topic and do 3-5 per week. This builds familiarity with exam question styles while the content is fresh. Mark against the real mark scheme and log errors.

Identify your weak topics

By mid-Year 11, you have covered most of the syllabus. Do an audit using the syllabus checklist. Rate every topic as green (confident), amber (shaky), or red (weak). This audit determines where to focus the structured revision period.

Address topic gaps immediately

If the audit reveals red topics, do not wait until the revision period to fix them. Start gap recovery now. Closing a gap takes two to three weeks of focused work, and there is more time available now than there will be in the final weeks before exams.

The 12-week timeline before the exam

Whether you sit Oct/Nov or May/Jun, the final twelve weeks before your first chemistry paper should follow a structured plan.

Weeks 12-9: Topic revision (one topic per 2-3 days)

Work through each syllabus topic in order:

1. Read the relevant textbook section for the topic (20 minutes).
2. Close the book and do an active recall test (15 minutes).
3. Review and update flashcards for the topic (10 minutes).
4. Do 3-5 past paper questions on the topic (20 minutes).
5. Mark and log errors (10 minutes).

At this pace, you cover the twelve topics in roughly four weeks. Weak topics get an extra day; strong topics can be done in one day.

Weeks 8-5: Timed past papers begin

Shift to full timed papers: one Paper 2 and one Paper 4 per week, done under exam conditions. Mark against the real scheme. Log every error. Use the 8-week revision plan for detailed weekly targets.

Continue daily flashcard review (10 minutes) and three to five daily practice questions on weak topics.

Weeks 4-2: Intensify

Two full papers per week. The error log should show a shrinking list of problem areas. Address the remaining issues with targeted study. If a topic is still weak at this stage, spend an entire session on it: textbook review, active recall, and then past paper questions until you score consistently.

Practise Paper 6 if you are sitting it: the alternative to practical guide covers the specific skills needed.

Week 1: Final consolidation

Light revision only. Go through flashcards. Re-read your error log. Review one-page topic summaries. Do not start new content. Do not cram. Sleep well every night. Read our advice on the night before the exam and prepare your exam day checklist.

The honest assessment

If you are reading this and exams are less than four weeks away with minimal preparation done, you must triage. You cannot cover the entire syllabus from scratch in four weeks. Focus on:

1. The highest-weight topics (acids and bases, periodic table, stoichiometry, organic chemistry appear most frequently)
2. Factual content that can be quickly memorised (ion tests, reactivity series, definitions)
3. Past papers to learn the exam format and pick up technique marks

This is damage limitation, not ideal preparation. The ideal is the twelve-week timeline above, starting with solid Year 10 foundations. But damage limitation still produces a better result than doing nothing.