You should be aware that the questions will be very similar to the ones you've been studying on the discs and in the study guide. I think they're similar but not the same. I've heard it explained that the questions on the exam are worded in a way that makes them a bit more tricky to understand. Also, the questions from each domain will not be segregated. They'll be mixed up with one another. That sounds like a "duh" statement. But, it can throw some people off after they've been studying chapter-by-chapter for a long period of time.
Having said all that, I strongly second Boomslang's sentiment. If you've studied like you say you have, I'm betting you'll be fine. It's not a super difficult exam for people who study thoroughly and who "test well". Good luck!