I have an audition for a stage show of fame the musical. Anyone have any advice?

I have an audition for fame the musical next weekend!! argh! It has been my dream since I saw the musical when I was 12 years old to be in it and when I saw an advert to audition I had to try. I am a very keen dancer and enjoy acting but not so much singing. The show is part of a summer program that lasts two weeks where you work with a production team then put on the musical for 2/3 nights. It is for 11-21 year olds and I am 21 which I was weary about but don't know what to expect so am giving the audition a go. Also being a bit older now I am a bit out of practice since doing lots of cles in my teen years but then coming to university and not being able to continue with them as much. I am worried everyone else will be really good and I won't match up! I'm quite prepared for this to happen because I am aware that I won't have as much training as everyone else as I started dance cles quite late I am not flexible in ballet. However I am determined to show energy and confidence whatever happens! Anyhow I was just wondering if anyone had any advice for the audition?? I have been listening to the songs from the musical, seen the film etc. Thanks! :)