Seft said:I wouldn't bother. Rather do an A2 (maths would be the obvious choice) this year with three AS levels (Physics is a doddle but I don't know about the other two), then take further maths with the other A2s (or possibly drop one of them).
To answer your question: if you're confident that you'll get AAAA, then by all means take a fifth, but don't expect to be impressing any universities (other than Oxbridge). They aren't terribly fussed about more than three A-levels, they'll just let you take the best three for your offer (or similar). Also, media (and maybe music too for most degrees) might not be something they'd be prepared to make an offer on.
Yeah, i see, you guys seem to have persuaded me not to take a fifth. Thanks for the help. I think Computing, Maths and Physics will be good A2s to try to get As in