Overview
Mastering Cambridge IGCSE Chemistry (0620) comes down to a methodical revision strategy built around official exam materials. By understanding the specific demands of each paper and the precision required by the mark schemes, you can turn past paper practice into a powerful tool for improvement. This guide outlines exactly how to use these resources to target the highest grades.
Understanding the IGCSE Chemistry Papers
For Cambridge syllabus 0620, your IGCSE Chemistry assessment consists of three papers. Everyone sits a theory paper—either Paper 2 (Core) or Paper 4 (Extended)—which tests your theoretical knowledge with a mix of short-answer and structured questions. You will also sit one practical skills paper: either Paper 5 (Practical Test), a hands-on lab session, or Paper 6 (Alternative to Practical), a written exam that tests the same skills. Your school chooses your tier of entry (Core or Extended), which is a crucial decision as it caps the maximum grade you can achieve.
The Cambridge Marking Philosophy: Precision is Everything
For Cambridge syllabus 0620, iGCSE Chemistry is marked using a strict point-based system, meaning there are no half-marks for 'nearly correct' answers. Examiners look for specific key terms and data, and precision is non-negotiable. For example, a balanced chemical equation requires not only the correct formulae and stoichiometry but often the correct state symbols (s, l, g, aq) to earn full marks. Similarly, describing a reaction might require you to use the term 'precipitate' rather than a vague phrase like 'a solid was formed'. This level of detail is what separates the top grades from the rest.
How to Find and Use Past Papers Effectively
Cambridge International publishes an extensive archive of past papers, mark schemes, and examiner reports on its public website shortly after each exam series concludes. These are the gold-standard resources for your revision. While you can [browse Cambridge past papers](/past-papers) on our platform, the key is not just to *do* the papers but to use all three documents together. The examiner reports are particularly valuable, as they provide a commentary on how students performed in a given year, highlighting common errors and misunderstandings that you can learn to avoid.
Core vs Extended: Making the Right Choice
For Cambridge syllabus 0620, the tier you are entered for has a direct impact on your potential results. The Core tier (Paper 2) assesses the core syllabus content and is aimed at students targeting grades from C to G. The Extended tier (Paper 4) assesses the core content as well as the more challenging 'Supplement' material, and is designed for students capable of achieving grades from A* to E. You cannot be awarded an A* or an A if you sit the Core paper, so it's vital to discuss your tier of entry with your teacher to ensure it aligns with your academic ambitions.
The Ultimate Revision Loop: Test, Mark, Improve
The most effective way to revise for 0620 is through a disciplined, active-recall loop. First, attempt a full past paper under strict, timed conditions, replicating the exam environment as closely as possible. Second, use the official mark scheme to [mark your past paper](/mark) with absolute honesty—if your answer doesn't match the scheme's wording or values exactly, don't award yourself the mark. Third, create a detailed error log, noting every single mark you dropped and, crucially, *why* you dropped it. Finally, use this log to direct your revision, re-learning concepts and practising the specific skills you lacked before repeating the cycle with a new paper.
Frequently asked questions
This section covers Frequently asked questions — ranked by what Cambridge examiners return to most often in past papers.
How many past papers should I do?
Focus on the quality of your practice, not just the quantity. Systematically completing 5–8 recent papers using the 'Test, Mark, Improve' loop is far more effective than passively looking at 20. This active process identifies and fixes your specific weaknesses, which is the fastest way to improve your score.
What's the difference between Paper 5 and Paper 6?
Paper 5 is a hands-on practical exam where you perform experiments in a laboratory. Paper 6, the Alternative to Practical, is a written paper where you answer questions about experimental procedures, interpret data, and plan investigations. Your school decides which one you sit, but both papers assess the same set of practical skills.
Can I use a calculator in the IGCSE Chemistry exam?
Yes, a scientific calculator is allowed in all papers and is essential for the theory components (Paper 2 and Paper 4). You will need it for calculations involving moles, concentrations, relative formula masses, and empirical formulae. Make sure you are comfortable using your calculator well before exam day.
Where do I find official past papers?
Cambridge makes recent past papers, mark schemes, and examiner reports freely available on its public website. For a more organised and user-friendly experience, you can consult our general IGCSE past papers guide or browse papers directly on our platform. Always use official materials for the most accurate practice.