There are 2 Pharmacy schools in Ontario - U of T and Waterloo. I just got into U of T. And I know that U of T is extremely competitive. This year there were 1600 applicants or so. Some years there are close to 2000 applicants. I think this years entering class had a cumulative university average of 83. Also, high school marks are NOT weighed into your GPA calculation. You need to take quite a few university level courses to get in. For U of T, the requirements are in the transitional stage because they are moving from the UTPAT to the PCAT. By the time you're in university, you will need to complete 2 years of university, along with required courses. The Pharmacy site explains everything, so you should read all the info there [everything you need to know is there].
Note: I am NOT saying that high school courses don't matter because you need a good average to get into university. I am saying that marks don't stop at high school.