Which IGCSE subjects have the lowest pass rates?

Additional Mathematics, Physics, History, Chemistry, and Computer Science carry the lowest pass rates across all Cambridge IGCSE subjects.

Additional Mathematics is the most demanding. Fewer than 60% of candidates pass. The content covers calculus, trigonometric identities, and algebraic proof at a level most students first meet at A-Levels.

Physics has a passing baseline of roughly 71.8%. The paper demands constant switching between abstract theory and formula calculations, often within a single question. Students who only memorise formulas frequently lose marks on applied and practical-based questions.

History sits at roughly 66%, making it the second hardest by pass rate. Source-based analysis and extended essay writing are where most marks are lost. Reading widely is not enough; students need repeated practice with real Cambridge source materials under timed conditions.

Chemistry carries a passing baseline of approximately 75.7%. Mole calculations and organic reaction mechanisms require spatial reasoning that many students find counterintuitive. Biology tends to perform better because it rewards factual recall more directly.

Computer Science pass rates vary by exam board, with Cambridge CAIE and AQA producing different distributions. The pseudocode and algorithm design component is unforgiving. A single logical error in a loop or variable can cost full marks even when the overall approach is correct.

These five subjects share a common pattern. They each reward deep conceptual understanding over memorisation, and they test applied reasoning under time pressure rather than straightforward recall.

Students sitting these subjects benefit most from active revision methods. These are the six approaches that consistently close grade gaps:

• Build a daily error log to track repeated mistakes
• Complete past papers under timed conditions
• Compare essay drafts against official mark schemes
• Use retrieval practice instead of passive highlighting
• Track syllabus topics by confidence level
• Target weak areas with focused repetition

For students who need faster progress, live 1:1 IGCSE tutoring gives targeted feedback that self-study cannot easily replicate. Our blog has the full guide on revision strategies for each of these subjects, with subject-specific advice on how to approach the hardest Cambridge IGCSE papers.