If your current alevel choices will affect your degree choice i would change.
Do you find there is a large sports culture at your sixth form. A group such as the football team or the rugby team? At my sixth form everyday about 20 people will be wearing the colleges rugby kit (many whom you would think judging by their appearance are studying their 6th year at college yet their mental capacity seems significantly below average) and stay amongst themselves all day in a very homosexual manner