Really feel for your situation, and I am in a similiar one myself. I think I may be able to get A*A*A in Mathematics, Chemistry and English Lang/Lit respecitively this year, and am not so keen on the course I applied for, as I was rushed into it
. Now that I think about it, I should have applied for Natural Sciences instead, and Nottingham is currently the only university I've applied to that allows me to transfer to that degree
. I don't think I aimed high enough either, but that was due to poor GCSE results really. If I do pluck up the courage to withdraw my application and apply next year (bring on the fees :/) then I'd probably apply to Cambridge/UCL etc. I just know that if I had planned beforehand, and had been given more time and guidance, that I would have had a good chance at applying to Oxbridge and being confident with my application. If I withdraw my application this year, I'm not sure what I'd do in the Gap Year to strengthen my personal statement.