I am in the same position! I have already received two of my AS's in Art and Photography and turns out I got half marks! I am unsure as how to go ahead, as I know I can do so much better! Hopefully getting A's at A2, however now I doubt I will get any University offers for anything near what I want..
There doesn't seem to be any point in re-doing this year unless I don't get into the A2 courses.