Yeah, well just remember, you can only do your best - which will no doubt be good enough with predicted grades like that! Worrying is the worst thing you can do. Pretend you're not nervous and chances are you won't be! (it works for me anyway)
I have a friend whose sister got all A*s at GCSE and his parents had really high expectations of him, he had like 7 A*s and 5 As or something, and his parents just said to him 'you could have done better' and one of his parents didn't even say anything to him at all! I think that's really mean, the pressure on us to do well in exams is so great anyway, and the questions are always phrased to catch you out...anyone else feel this way? Grrrr!