Realistically, I know I'm going to get negged for this, but I knew I had done well enough in everything to get A*/A (except chemistry) because I revised my butt off and felt that nothing went disastrously wrong (except chemistry).
Here were my expectations before results day:
Maths: A*
English Lit: A
English Lang: A
Physics: A*
Chemistry: B
Biology: A
German: A (because I really could not tell how well my oral had gone!)
History: A*
Art: A
Classical Civilisation: A*
So I was realistically expecting 4A*s, 5As and 1B
What I actually got:
Maths: A*
English Lit: A
English Lang: A*
Physics: A*
Chemistry: A* (I can only conclude that everyone did badly as it was a v.hard paper and the grade boundaries were low)
Biology: A*
German: A*
History: A*
Art: A
Classical Civilisation: A*
So I actually got 8A*s and 2As. I had to check the statement sheet several times to believe it!
Honestly, don't worry too much, you tend to think you did a lot worse than you actually did and your results tend to be a lot better than your estimates. Even so GCSEs aren't massively important, good AS and A-Level predictions, Personal statement, interview and entrance tests make up larger proportions. Chin up, and enjoy your holiday!