Visit the library (yes these places really do exist and as students we really should make more of an effort shouldn't we!) and see if you can get a book on interview technique to brush up on any areas you're unsure of, maybe that'd help?
I've done a fair bit of prep for OASC as I was unsure whether or not i'd go to Uni after college. If you want to know what I did then feel free to drop me a PM.
Don't worry about being nervous, everyone going for it will be... I get terrible nerves and become a sweating wreck usually!
No doubt you'll handle it better than me!
