Practice Questions Solution:
Grade 5/6
https://www.cemc.uwaterloo.ca/contests/past_contests/2021/2021BCCContestSolutions5_6.pdf
Grade 7/8
https://www.cemc.uwaterloo.ca/contests/past_contests/2021/2021BCCContestSolutions7_8.pdf
Grade 9/10
https://www.cemc.uwaterloo.ca/contests/past_contests/2021/2021BCCContestSolutions9_10.pdf