British Columbia Secondary School Math Contest
Click on the year tabs for previous year samples and practice
The Centre for Education in Mathematics and Computing (University of Waterloo) http://cemc.uwaterloo.ca/contests/contests.html
Choose your grade, follow the link and explore the resources available
Canadian Mathematical Society
BC Math Contests linked to this page. Cool.
Virtual Mathematical Marathon
A yearlong opportunity to be challenged. You will have access to four new problems each week to challenge your brain and make you think.