IGCSE Chemistry MCQ revision guide

What you're actually sitting

IGCSE Chemistry (0620) multiple choice is two 40-question papers, Paper 1 (Core) and Paper 2 (Extended), at 45 minutes each. More students practise Chemistry on QuickMark than any other subject, and it averages 85%, so the bar is high.

Where students lose marks

• Mole and concentration calculations. The arithmetic is simple; the setup is where errors creep in.
• Ionic equations and charges. Balancing and charge-tracking questions punish rushing.
• Periodic trends and bonding. Easy to half-remember, easy to get caught on a distractor.

A practice plan that works

Our data shows the 2025 papers score lower than the 2023-2024 ones, so don't finish your revision on an easy old paper and feel falsely ready. Work the recent, lower-scoring papers from the Chemistry difficulty ranking last, under timed conditions, and keep an error log of the exact reasons you missed each question.

See the numbers

This guide is built on real performance data. Dig into the full IGCSE Chemistry statistics and paper rankings, or return to the Revision Hub for the other subjects.