Just a quick note: McMaster does not have a pharmacy school, we have pharmacology (i.e. the development and testing of pharmaceuticals) but not pharmacy (the distribution of said drug).
The only Pharmacy school in Ontario, IIRC, is U of T. U of T can be applied to after first year, they're now forcing you to do a standardized test before entrance and there are a few required courses (They're not very stringent, and you can complete them under the general first year life science program).
I'm not sure about exact averages, but generally speaking a 10, (about an 80% average) will get you into any second year science program. More specific requirements can be found in the course listings in the undergrad calender:
http://registrar.mcmaster.ca /CALENDAR/current
Here's a link to the UofT site for more info about their pharmacy school:
http://www.pharmacy.utoronto .ca/