You'll be fine! My, well, boyfriend I guess I can call him is currently stressing about school too. I feel like I am worthless with this sort of stuff as I have never been in the same position, but I can only say that if you keep you mind away from "OMG MY FUTURE!" and face it head on knowing that you are more than preparred for this test, you will be fine.
Chin up, head held high, deep breaths ... picture the audience naked. All that should help!