First of all, don't stress about it. You will walk out of the room and remember 5 things that you should have done, not finish exams or counsel, but hey, things will work out fine.
Books that I should have read, but only skimmed (I was in the middle of interview season) and yet found somewhat helpful:
1) First Aid for the CS
2) Blueprints for CS
Don't worry - you'll be fine. Good luck.