At this point, your best weapon is a good night's sleep. Don't think about the test too much the day before. I've seen your posts helping to explain concepts to other people, you've clearly studied hard and know the material. All you have to do now is just go to the test center and show that you do. Use the tutorial time in the beginning to relax your mind, I sat through the tutorial for 10 mins just getting used to the environment. Relax and take it one question at a time, it's just like another practice test, and don't worry too much if you're not 100% sure of an answer, mark your best guess and move on. Good luck!