Archives

I maintain problem archives for High School Olympiads:
Physics / [readme] / [errata]
Astronomy / [readme]

Handouts

Thermodynamics:  Vapours
EM:  Magnetic charges
Optics:  Russian problems

Bulgarian IPhO team selection tests

IPhO resources (in Bulgarian)
IOAA resources (in Bulgarian)

Advice

Studying for Olympiads
Exam Technique

Tutoring

This year I'm doing some tutoring for Physics Olympiads.
For more details, see here.