i think you have to be 18- but dont count me on it. best to email unis and find out.
When you say you are scoring 85% atm, do you mean in your AS?
What qualifictions are you doing- im not reallly uptodate with canadian system!?
oo you do know for Birmingham- great uni- that you need 7 A*s at GCSE (thats assuming you do GCSEs in Canada)
also do you not have any hobbies? it might help if you have a few. and get some work experience.
ok med schools- depends which course you want to do- modern-PBL or traditional or a bit of both. Bascially do you want to have clinical contact immediately- thats what you have to ask yourself.
hope that helps