I guess I over-prepared. I bought most of what was available and started preparing the last semester of my MSN. Two MUST-HAVES: Hollier and Fitzgerald CDs! Two different approaches, but both were represented on the exam. I also attended Hollier's review the weekend before my certification exam mainly to boost my confidence and identify areas of weakness. I also purchased a couple of books of certification practice questions. I think this was the biggest help of all. It trains your brain to think in a certain way when you see the questions on the cert. exam. If I had not taken SO MANY practice exams prior to the real one, I would have freaked out!! The exam was hard and I was sure I had failed....but alas, I passed! Oh yea, one more added bonus of preparing so much for certification: I felt better transitioning into my first Internal Medicine position. (Any suggestions out there about how to sell my review books and CDs now, I am not having any luck on Craigslist? Has anyone used AMAZON to sell books?)