British Mathematical Olympiad Subtrust
BMO papers
Calendar
News
Links
Current events:
25 February–1 March: Romanian Master of Mathematics
(see
full calendar
for more)
Maths sites
The United Kingdom Mathematics Trust
NRICH: Mathematics Enrichment
(note that BMO questions are often discussed on
Ask NRICH
)
The International Mathematical Olympiad
(official site)
IMO Foundation
MathLinks Math Forum