It's ok, I screwed up my maths too . Gotta love when you walk out of the exam and 10 minutes later you realise you did a bunch of dumb mistakes...Yeah, I had a bit of a brain fizz. :/
I got 82% in the trial and beat the guy that came second by like 10 marks and in the HSC 4 guys beat me and did a lot better than the trial. So I dunno what happened.