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O Level / IGCSE — Class 9 to 12
Free, chapter-wise notes, MCQs, solved exercises, and past papers for every Cambridge International (O Level) subject — organized by class, ready to explore below.
No matching subject found.
Sciences
Cambridge O Level science subjects, with syllabus codes as listed on your reference.
Mathematics & Computer Science
Mathematics, Additional Mathematics, and Computer Science.
Languages & Religious Studies
Compulsory language and religious/national studies subjects.
Humanities & Social Sciences
Social science and humanities electives.
Business & Commerce
Commerce and business-related electives.
We’re building complete O Level / IGCSE notes for Class 9 through 12, subject by subject. Each subject page will include chapter-wise explanations, solved exercises, MCQs, and short & long questions — aligned with the current Cambridge O Level syllabus, in both English and Urdu medium where applicable.
Subjects are grouped into five categories — Sciences, Mathematics & Computer Science, Languages & Religious Studies, Humanities & Social Sciences, and Business & Commerce — covering all 17 O Level subjects from our reference list, each shown with its Cambridge syllabus code. Each subject card goes live as its notes are published — nothing here links out until the content is actually ready.
Once live, notes will feature:
Chapter-wise summaries
Solved exercises
MCQs
Short & long questions
Past paper references
Yes — every subject on this page will be completely free, with no registration required, in line with the rest of CrimsonPDF’s tools.
The syllabus codes shown here are Cambridge O Level codes. IGCSE uses different codes for several subjects (for example, Mathematics is 0580 under IGCSE vs 4024 under O Level), so IGCSE-specific pages will be added separately rather than mixed in with these.
O Level and IGCSE aren’t split into Class 9-12 the way Pakistani boards are, so subjects here are grouped by category — Sciences, Mathematics & Computer Science, Languages, Humanities, and Business — instead.
Yes — this covers the subjects from our current reference list; more O Level and IGCSE subjects can be added as they’re confirmed.
That’s the goal — each subject page will include topic-wise notes, solved exercises, and past paper references aimed directly at Cambridge O Level exam preparation.