Practice Questions

Cayley, Fermat, Euclid, Galois, Hypatia

http://www.cemc.uwaterloo.ca/contests/past_contests.html

Alberta High School Mathematics Competition (AHSMC) - you'll need to then click on "archive"

http://www.math.ualberta.ca/~ahsmc/past.html

Canadian Open Mathematics Challenge (COMC)

http://www.math.ca/Competitions/COMC/

American Mathematics Competitions (AMC)

http://amc.maa.org/