The practice exam for 2012 should be helpful. Just make sure you glean all the value from it that you can. Take it within the appropriate time restriction. Go back and read and understand the rationales, even the ones you got right. I liked using the AAPC practice exams, too. Some people disagree with me, but I definitely had a few questions on the real exam that were exactly like the ones on the AAPC practice exam, so I felt they were well worth the money.
Pack up everything you need the night before, get a good night sleep, wear layered clothing in case the room is too hot or frigid. I'm a serious breakfast eater and know lots about the importance of nutrition, so I had protein in my breakfast that helped to sustain me and I brought water and energy bars (ate only one). Allow extra time to travel to the exam so you can start the exam as unfrazzled as possible.
At the exam, do some of the easy sections first, such as Medical Terminology and Anatomy.
If you have your books bubbled and highlighted you will be ready!