0620 is Cambridge IGCSE Chemistry. This page explains what the code covers, which papers it is examined by, and which topics carry the most marks — counted from 1,695 real past-paper questions set between 2022 and 2026.
0620 is the Cambridge syllabus code for IGCSE Chemistry. Schools and students in Pakistan usually call it O Level Chemistry: Cambridge IGCSE sits at the same stage as Cambridge O Level, and IBCC treats the two as equivalent. The code on your statement of entry still reads 0620.
ExamYard publishes a question book for this syllabus, covering the following:
Every topic in the 0620 banks, with how many questions and marks each has carried since 2022. The heaviest topics are where revision time pays back fastest.
| Topic | Questions | Marks |
|---|---|---|
| States of Matter | 67 | 81 |
| Atoms, Elements and Compounds | 228 | 592 |
| Stoichiometry | 162 | 395 |
| Electrochemistry | 85 | 191 |
| Chemical Energetics | 63 | 124 |
| Chemical Reactions | 189 | 507 |
| Acids, Bases and Salts | 144 | 340 |
| The Periodic Table | 121 | 226 |
| Metals | 161 | 316 |
| Chemistry of the Environment | 108 | 152 |
| Organic Chemistry | 267 | 681 |
| Experimental Techniques and Chemical Analysis | 100 | 146 |
Biggest topic: Organic Chemistry, 681 marks across 267 questions.
Across every 0620 paper in these banks, the three biggest topics are Organic Chemistry (681 marks), Atoms, Elements and Compounds (592 marks) and Chemical Reactions (507 marks). The first of those alone is about 18% of the whole bank. The smallest is States of Matter at 81 marks.
That matters because revising by whole past paper spreads your time evenly over topics the examiner does not weight evenly. Working topic by topic lets you spend the most time where the most marks are, and it shows you the handful of question shapes each topic actually uses rather than meeting one of them every few weeks.
The same figures broken down further — every chapter ranked, with the ten biggest sub-topics and how many marks an average question in each one is worth — are on the IGCSE Chemistry 0620 topic frequency page.
Past papers are easiest to use when the questions are already sorted by topic, so you can finish one topic before starting the next instead of meeting it once every few papers. ExamYard prints the real Cambridge questions for IGCSE Chemistry 0620 arranged that way, with the mark scheme kept separate from the question. Chapter 1 of every book is free to read, with no account and no email address.
0620 is Cambridge IGCSE Chemistry.
The questions in these banks come from papers set between 2022 and 2026. Nothing older is included, because Cambridge changes syllabuses and older questions can test content that is no longer examined.
1,695 real Cambridge questions worth 3,751 marks, sorted by topic.