I think you would need a certain background to go to Oxbridge, hehe, I certainly wouldn't fit in.
One of Plonkings friends went to Oxford and I dunno, I always feel I have to behave myself around him, no rude comments and things, don't think I could cope with that.
Plus getting A's isn't everything. I only needed DDD to get onto my course, and some courses require even less. Some people may completely mess up there A levels but get a course in clearing and go on to do pretty well. I know someone who flunked completely at A level got onto a course at uni and left with a resonably good grade. Not everyone can be a smartarse
EDIT-also i think halc is saying that just if you dont do as well as you wanted, if you try again etc or try a different route, you may get where you want. Not everyone wants to become PM or something, most of the real people in the world, have much more modest goals.