To shab12:
The advice I would give would be to take as many practice exams as you can. Take one right off the bat to see what your current knowledge level is (the practice exam in your Giles books should break everything down into how well you did in each section). Make sure the exams are spaced out enough so that you can work on your weak areas. Besides the three exams in your book there are 2 additonal exams online, plus the exams in your O'Sullivan review. The practice exams really help on your test taking endurance and concentration. Besides that have all basic concepts memorized (lab values, wound stages, levels of assist, rancho scales, etc.). Lastly, study as much as you can without burning yourself out; organize it to the method that has worked best for you previously (in a group, using flashcards, etc.).