Hard problems for the national and international olympiads. Think first, then calculate.
48 mock tests · 16 questions · 16 problems
Our full olympiad papers follow this pattern.
Physics, Chemistry, Mathematics and Biology
Each subject: 15 questions, 30 minutes
Correct answer +3, wrong answer −1
Chapter tests and full papers. You get your score as soon as you finish.
No timer. Work at your own pace.
Hardest first. Try each one on paper before you see the answer.
Questions
The full list, by topic and level, each with a worked solution.
Problems with worked solutions