The biggest revision mistake IGCSE students make isn’t revising too little — it’s revising the wrong things. With exams starting imminently, every revision session needs to be directed at topics that will actually move your marks. This guide explains exactly how to decide what to revise next.

The Problem with Random Revision

Many students approach revision by opening their notes at the beginning and working through topics in order, or by picking whichever topic they feel like on a given day. Both approaches ignore the two things that actually determine your grade:

1. Which topics you’re weakest on — not all topics need equal attention
2. Which topics are most frequently examined — some topics appear every year, others rarely

Revising a topic you already know well, when it only carries 3 marks on the paper, is a poor use of time. Revising a topic you’re shaky on that appears in every exam is the highest-return revision you can do.

The Priority Framework: Three Factors

The most effective revision order is determined by three factors combined:

Factor 1: Your Weakness on Each Topic

Rate yourself on each topic from 1 (confident) to 5 (not started or very uncertain). Topics rated 4–5 need the most attention.

Factor 2: How Often the Topic Appears in Exams

Some topics are examined every single year in Cambridge IGCSE. In Biology, for example:

• Always examined: Enzymes, Osmosis and diffusion, Transport in animals, Gas exchange, Inheritance
• Usually examined: Photosynthesis (limiting factors), Coordination and response, Diseases and immunity
• Occasionally examined: Biotechnology, Drug effects

A topic you’re weak on AND that’s always examined should be your first priority.

Factor 3: How Many Days Until Your Exam

With 7+ days remaining, you can address 4–5 weak topics properly. With 3 days remaining, focus exclusively on your weakest 1–2 topics. Don’t try to cover everything in the final days — depth on your weakest points beats breadth.

How to Apply This in Practice

Step 1: List all topics for your subjects. Your syllabus or a revision checklist will have these.

Step 2: Rate each topic 1–5. Be honest — 1 means you could explain it confidently on an exam tomorrow, 5 means you’ve barely looked at it.

Step 3: Mark each topic’s exam frequency. Look at past papers from the last 5 years and note which topics appear consistently.

Step 4: Build your priority list. Topics that score high on weakness AND high on frequency go to the top. Topics you’re strong on can be reviewed briefly in the final days.

Use the Revision Priority Planner to do this automatically: Select your subjects, rate each topic, enter your exam dates, and get a ranked list instantly →

Subject-Specific Priority Topics

Cambridge IGCSE Biology (0610)

Highest priority (examined every year, high marks): Enzymes (active site, denaturation, rate of reaction), Osmosis and diffusion, Transport in animals (heart, blood vessels, blood composition), Gas exchange (alveolar adaptations), Respiration equations (aerobic and anaerobic), Inheritance (monohybrid crosses, Punnett squares)

High priority: Photosynthesis (limiting factors, word and symbol equations), Diseases and immunity (antibodies, vaccination), Coordination (nervous system, reflex arc, hormones)

Cambridge IGCSE Chemistry (0620)

Highest priority: Stoichiometry and moles calculations, Electrolysis (electrode products, half equations), Rates of reaction (particle theory), Acids, bases and salts (neutralisation, salt preparation), Organic chemistry (alkanes, alkenes, reactions)

High priority: The Haber Process and Contact Process (conditions and reasoning), Atomic structure and bonding, Energetics (exothermic, endothermic, bond energy)

Cambridge IGCSE Physics (0625)

Highest priority: Motion equations (v=u+at, v²=u²+2as), Forces (Newton’s laws, weight vs mass), Electricity (V=IR, power, parallel/series circuits), Waves (v=fλ, reflection, refraction), Thermal physics (specific heat capacity Q=mcΔT)

High priority: Electromagnetic induction (transformer equations), Nuclear physics (half-life, decay equations), Pressure (P=F/A, fluid pressure)

Cambridge IGCSE Mathematics (0580) Extended

Highest priority: Algebra (quadratics, simultaneous equations, indices), Geometry (angle theorems — reasons required), Trigonometry (SOHCAHTOA, sine/cosine rule), Transformations (describe fully), Statistics (mean from grouped data, cumulative frequency)

High priority: Vectors, Probability (tree diagrams, Venn diagrams), Circle theorems, Functions

The Final Week: What to Do

6–7 days out: Tackle your top 3 priority topics from the list above. One topic per day, 45-60 minutes of focused past paper questions — not notes.

3–5 days out: Full past paper under timed conditions. Mark it. Note which topics still cost marks. Do a 30-minute focused session on any that appear.

1–2 days out: Review your weakest topic one more time — briefly, from notes, not a full session. Check your equipment and exam schedule. Stop revising by 8pm the night before.

Exam morning: Quick review of key formulas or definitions. Do not attempt new practice.

Tools That Help

Revision Priority Planner — rate your confidence on every topic across your subjects, enter exam dates, get a ranked priority list. Saves in your browser so it’s there every time you open it.

Topic Question Bank — practise past paper questions on specific topics, not whole papers

Mark Scheme Decoder — learn to write answers exactly the way Cambridge marks them

Grade Boundary Tracker — know which grade band your current marks put you in

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