I'm guessing most people on this thread are moderately obsessed with their grades and getting into oxbridge. Just so you know, people with straight A*s can get rejected outright; and on average about 1/5 oxbridge applicants are successful. So please don't get your heart set on it so early on like my cousin did; the people you would be up against would be no worse than you, because after around 4 A*s it begins to make no difference. Unless your applying to medicine. But that can be even harder than getting into some oxbridge courses...