how to apply for a university in canada?

I am an international high students in Manitoba, Canada. If I want to apply University in B.C. Canada, what I need to do? I am in grade 11. My major will be physics in university. I want to know which course I need to take next year? I have done Physics 40S, PE 40. I wander if i need to take pre-calculus 40 and what about the time of volunteer? I want to apply for UBC, what about GPA?

Speak to your High School guidance counselor./