Introduction
IGCSE Chemistry (0620) is one of the most popular Cambridge subjects, but it’s also a common hurdle for students aiming for A* grades. The subject demands memorization, application, and practical skills. Every year, only 15-20% of candidates achieve an A* globally.
But here’s the good news: with the right strategy, you can join that top 20%. This guide covers the complete IGCSE Chemistry syllabus, effective revision methods, past paper analysis, and a day-by-day study plan.
Whether you’re in the UK, USA, UAE, India, or Pakistan (Cambridge system), these tips work.
Understanding IGCSE Chemistry (0620) – Key Changes for 2025-2027
Cambridge International updated the syllabus for 2025-2027. Key points:
| Aspect | Details |
|---|---|
| Exam code | 0620 |
| Papers | Core (C1-C6) or Extended (C1-C6) |
| Total marks | 160 (Extended) |
| Practical component | Paper 4 (Alternative to Practical) or Paper 5 (Practical Test) |
| A* threshold | Usually 140-150/160 |
Paper structure (Extended):
- Paper 2: Multiple Choice (40 marks) – 45 minutes
- Paper 4: Theory (80 marks) – 1 hour 45 minutes
- Paper 5 or 6: Practical (40 marks) – 1 hour 15 minutes
Note: Most top students take the Extended curriculum (Core only goes up to C grade).
Complete IGCSE Chemistry Syllabus (12 Topics)
- States of matter – Solids, liquids, gases, diffusion
- Atoms, elements & compounds – Atomic structure, periodic table, bonding (ionic, covalent, metallic)
- Stoichiometry – Moles, empirical formula, balancing equations
- Electrochemistry – Electrolysis, half-equations, applications
- Chemical energetics – Exothermic/endothermic, bond energy
- Chemical reactions – Rates of reaction, reversible reactions, equilibrium
- Acids, bases & salts – pH scale, neutralization, preparation of salts
- The Periodic Table – Trends, groups (alkali metals, halogens, noble gases), transition elements
- Metals – Reactivity series, extraction, rusting
- Chemistry of the environment – Water, air pollution, greenhouse effect
- Organic chemistry – Alkanes, alkenes, alcohols, carboxylic acids, polymers
- Experimental techniques – Chromatography, distillation, titration
7 Proven Strategies for an A* in IGCSE Chemistry
1. Master the Syllabus (Don’t Miss a Single Point)
Download the official Cambridge IGCSE Chemistry 0620 syllabus (2025-2027). Print it. Tick every sub-topic as you study. If the syllabus says “describe the trend in reactivity of Group 1 metals,” you must be able to write 4-5 bullet points.
2. Use Active Recall, Not Passive Reading
Reading your notes 10 times is useless. Instead:
- Cover your notes and explain the topic aloud.
- Write everything you remember on a whiteboard.
- Use flashcards for definitions (e.g., “What is an isotope?”).
3. Solve Past Papers from 2019 to 2024
Cambridge reuses question styles. Download all past papers (available free on PapaCambridge, SaveMyExams, or FreeStudy.pk). Solve at least 10 full papers.
Pro tip: Time yourself exactly as per exam. For Paper 4 (1h45m), sit without distractions.
4. Memorize Key Definitions Word-for-Word
Cambridge examiners award marks for exact wording. Memorize these:
- Relative atomic mass – Average mass of one atom compared to 1/12 mass of carbon-12.
- Oxidation – Loss of electrons OR gain of oxygen.
- Reduction – Gain of electrons OR loss of oxygen.
- Isotopes – Atoms of same element with same protons but different neutrons.
5. Master Mole Calculations (Stoichiometry)
This is the highest-yield topic. Practice:
- Moles = mass / Mr
- Moles = concentration × volume
- Empirical formula from percentages
Do 50 calculation questions before your exam.
6. Don’t Ignore the Practical Paper (Paper 6)
Many students lose easy marks in Paper 6 (Alternative to Practical). Learn:
- How to draw a titration diagram
- Tests for gases (e.g., hydrogen pops, limewater turns milky for CO₂)
- Flame test colors (lithium = red, sodium = yellow, potassium = lilac)
7. Review Examiner’s Reports
Cambridge publishes examiner’s reports after each session. Search “Cambridge IGCSE Chemistry 0620 examiner report November 2024”. You’ll learn exactly what mistakes students make.
Question-Answer Section (Google Snippet Ready)
Q1: Is IGCSE Chemistry harder than GCSE?
A: IGCSE Chemistry is slightly more demanding than standard GCSE because it includes more content (e.g., organic chemistry, electrolysis) and has fewer multiple-choice questions. However, with proper preparation, it’s manageable.
Q2: How many hours should I study for IGCSE Chemistry?
A: Aim for 4-5 hours per week over 6 months, then increase to 8 hours per week in the final 2 months. Top students study 150-200 total hours.
Q3: What are the best free resources for IGCSE Chemistry?
A: SaveMyExams (free notes), PhysicsAndMathsTutor (past papers), ChemGuide, and YouTube channels like Cognito, Freesciencelessons, and FreeStudy.pk (upcoming).
Q4: How to memorize the reactivity series?
A: Use a mnemonic: “Please Stop Calling Me A Careless Zebra Instead Try Learning How Copper Saves Gold.”
(Potassium, Sodium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Tin, Lead, Hydrogen, Copper, Silver, Gold)
Q5: What percentage is an A in IGCSE Chemistry 0620?*
A: For extended curriculum, A* typically requires 85-90% (136-144/160). Thresholds vary slightly each session.
Sample 3-Month Revision Plan (Final Stretch)
| Week | Focus |
|---|---|
| Week 1-4 | Revise all 12 topics. Make summary notes for each. |
| Week 5-6 | Solve topic-wise past papers (e.g., only mole questions from 10 papers). |
| Week 7-8 | Full past papers (Paper 2, 4, 6) under timed conditions – 3 papers per week. |
| Week 9-10 | Identify weak topics. Redo those questions. Memorize definitions. |
| Week 11-12 | Mock exams. Review examiner’s reports. Practice practical diagrams. |
Common Mistakes (And How to Avoid Them)
❌ Not writing units in calculations – Always write units (g, mol/dm³, etc.). Cambridge deducts marks.
❌ Confusing alkanes and alkenes – Alkanes: single bonds, saturated. Alkenes: double bond, decolorize bromine water.
❌ Ignoring half-equations – Practice ionic equations for electrolysis.
❌ Skipping practical paper – Paper 6 is 25% of your grade. Study it.
❌ Using outdated syllabus – Don’t use 2019 syllabus for 2025 exam. Download the latest.
Best Resources for IGCSE Chemistry
Free:
- SaveMyExams – Notes & topic questions
- PhysicsAndMathsTutor – Past papers
- YouTube: Cognito, Freesciencelessons
Paid (optional):
- Cambridge IGCSE Chemistry Coursebook (4th edition) – by Richard Harwood
- Revision Guide – CGP or Hodder
Conclusion
Scoring an A* in IGCSE Chemistry is realistic if you follow a structured plan. Focus on the syllabus, practice past papers actively, and master mole calculations and definitions. Remember: consistency beats cramming.
For free video lectures, downloadable revision notes, and mock tests, visit FreeStudy.pk – coming soon with complete Cambridge support.
Internal Links (to be added):
- “How to Get an A* in IGCSE Physics” (coming soon)
- “IGCSE vs GCSE: Key Differences” (coming soon)
External Link: Cambridge IGCSE Chemistry 0620 syllabus – cambridgeinternational.org
