I would echo what Pride has said Try to prepare for loads of obvious questions, I was asked "What positions of responsibility have you had around school?", "If a younger student came and told you something really serious, but asked that you not tell anybody else, what would you do?", "What would you like to change about the school?" and plain ol' "How would you describe yourself?", among others.
Try to set yourself apart from other applicants, what have you done that they haven't?
Don't be arrogant, but try not to be too modest either. Try to say things that you can easily back up and prove; "I am reliable" is okay, "I am reliable and responsible, shown by the fact that I have a perfect homework record" is better. When I was asked to describe myself, I said that I wasn't very confident, but that I was working on becoming better, which made me look honest, without me having to explicitly say "I am honest" XD
Try to appear at ease, even if you're feeling really nervous. Sit up straight and make eye contact with your interviewers. If you have long hair, it may help to tie it up, as then you won't be tempted to fiddle with it (I should have done this, haha ) It also makes you look a little bit neater. It goes without saying that your uniform should be perfect too
Best of luck! Let us know how you get on. Super well done on getting this far, lets hope you can go all the way
Last edited by Little Tail Chaser; 11-07-2012 at 22:12.