bloody hell, the person is only asking a question. whats with this hostility.
Don't know much about oxford but you need alot of A* as GCSE and more than 3A at AS just to get an interview. (not totally sure on the figures, just email one of the admin tutors)
and for colleges Gonville and Cais and Emmanuel are quite prestigious. But all colleges are pretty much equal.
Cais is prestigious cause its the biggest med college, (but with
25~ med students) Emma is prestigious cos its usually seen as the most academic college.