Some links which maybe useful to you:
Physics Problems and Past Papers
- 10th APhO with links to all past APhO's contest papers
- Links to All Physics Olympiad Competitions
- FYKOS – the Internet physics competition
- Rudolf Ortvay International Competition in Physics
- Australia's National Qualifying Exams for Science Olympiads
- POPTOR - Canada's Physics Olympiad Preparation Programme, University of Toronto
- Western Canada Physics Olympiad
- AAPT PhysicsBowls
- South Africa Science Olympiad Past Papers
- Problem of the Week by David Morin - Harvard Physics
- Solutions to I. E. Irodov's "Problems in General Physics"
- World Physics Olympiad