Overview
The best free revision resources for Cambridge IGCSE and O-Level in 2026 are a strategic combination of official exam materials and high-quality third-party platforms. Your foundation should always be the official past papers from Cambridge International, supplemented by comprehensive notes from ZNotes, targeted STEM practice from Physics & Maths Tutor, and modern learning tools from MarkScheme. Using these resources together provides a complete, effective, and entirely free pathway to top grades.
Start with the Source: Cambridge International
Before you look anywhere else, your first stop must be the official Cambridge International website. Here you can find the holy trinity of exam preparation: past papers, mark schemes, and examiner reports, all available for free. These are the single most important resources because they are created by the people who set and mark your exams. Working through them ensures you understand the question style, the level of detail required, and the common pitfalls that trip up other students. Examiner reports, in particular, offer invaluable insight into what examiners were looking for in any given year.
The Best Free Revision Notes: ZNotes
When it comes to learning and consolidating the syllabus content, ZNotes is the undisputed leader for free, high-quality revision notes. Created and curated by students who achieved A* grades, the notes are famous for being concise, syllabus-focused, and easy to digest. They cover a vast range of IGCSE and O-Level subjects, cutting through the textbook waffle to give you exactly what you need to know for the exam. They are perfect for building your initial understanding of a topic or for last-minute revision before tackling past papers.
For STEM Subjects: Physics & Maths Tutor (PMT)
For Cambridge free Cambridge revision resources, for students taking science, technology, engineering, and maths subjects, Physics & Maths Tutor (PMT) is an essential resource. While its name suggests a narrow focus, it offers an incredible depth of free material for Biology, Chemistry, Physics, Computer Science, and Maths. Its greatest strength lies in its extensive banks of questions by topic, which allow you to drill down on specific syllabus areas where you feel less confident. This targeted practice is perfect for bridging gaps in your knowledge after revising a topic using notes from a site like ZNotes.
Supercharge Your Practice with MarkScheme
Knowing the content is only half the battle; applying it under exam conditions is what secures the top grades. This is where a smart workflow comes in. After revising a topic, you should attempt past paper questions and then analyse your performance. MarkScheme offers a suite of free tools designed for this crucial stage. You can use our AI-powered [marking tool](/mark) to get instant, detailed feedback on your written answers, going far beyond what a standard mark scheme can offer. This helps you understand precisely how to structure your answers to meet the examiner's criteria.
Master Topics with Free Interactive Courses
To further strengthen your application skills, you can use our free, interactive [topic courses](/courses). These courses are built entirely from past paper questions and are designed to help you achieve mastery in specific areas of the syllabus. Instead of passively reading notes, you are actively learning and testing your knowledge with real exam questions in a structured format. This active recall method is one of the most effective ways to revise and build confidence. For a complete overview of the best tools available, check out our guide to the [best free Cambridge revision resources overall](/blog/best-free-cambridge-revision-resources-2026).
| Resource | Best for | Cost |
|---|---|---|
| Cambridge International | Official past papers, mark schemes, and examiner reports | Free |
| ZNotes | Concise, syllabus-aligned revision notes for a wide range of subjects | Free |
| Physics & Maths Tutor | Topic-specific question banks, especially for STEM subjects | Free |
| MarkScheme | AI-powered marking, feedback, and interactive topic courses | Free |
Frequently asked questions
This section covers Frequently asked questions — ranked by what Cambridge examiners return to most often in past papers.
Are free resources good enough to get an A*?
Yes, absolutely. The quality of free resources like official past papers and ZNotes is exceptionally high. Success depends more on your consistent and effective use of these tools, rather than paying for expensive subscriptions. Diligent practice, timed paper attempts, and detailed analysis of your mistakes are the real keys to achieving a top grade.
How many past papers should I do?
Quality over quantity is crucial. A good target is to complete the last 5–7 years of papers for each subject under timed conditions. More importantly, you should spend as much time reviewing your answers against the mark scheme and examiner reports as you did on the paper itself, ensuring you understand every mark gained and lost.
What's the difference between IGCSE and O-Level resources?
While many topics overlap, IGCSE and O-Level are distinct qualifications with different syllabus codes and assessment styles. It is vital to ensure the resource you are using explicitly matches your syllabus (e.g., Cambridge IGCSE Physics 0625 vs. O-Level Physics 5054). All the reputable resources mentioned here clearly label their materials by qualification and syllabus code.