Hi
I can't answer your questions, but I'm in the same waters as you so thought I'd join this thread.
Similarly, I received my AS results on thursday:
Maths: 100%
English Literature: 100%
Philosophy&Ethics: 98.5%
History: 84.5% (arghhhhh)
General Studies: C
Firstly, will general studies matter if applying to Oxbridge?
Secondly, I would love study PPE at Oxford but Cambridge offer philosophy and I may stand more of a chance at Cambridge as they will average my best three giving me an insanely high UMS average. Also, my GCSEs aren't amazing: 9A*s and 1B (french). They're good, but it's not 12A*s - which Oxford would love, especially for PPE.
Thirdly, how did you calculate your pA*? Have you accounted for the context of your school? I went to an average state school, 67% getting 5 or more A*-Cs or so, so I think that's reflected in the GCSE scoring thing. Atm I'm at an average sixth form college in the north of england,
So yeah sorry for not answering your questions - my first reaction is that you could have a lot more to worry about than you presently do. What course are you applying for exactly?
Christian