See Ms. Podio in the math department to sign up for this year's Fall Math Contests.
These include the COMC Sun Life Open math challenge, aimed at grade 12 students and top students from younger grades.
You could also take on the University of Waterloo's Intermediate (gr 9 and 10) or Senior (gr 11 and 12) math contests, or the Beaver Computing Challenge, an online logic and problem solving test aimed at grades 9 and 10.
Contests range from $2 for the Beaver, to $14 for the COMC. See Ms. Podio for a form as soon as possible!