Don't stress out. You already have the knowledge you need to pass the Nclex and you will, so don't go buying a lot of review books. There really are only a handful of books out there that review the new format nclex questions, and even fewer books that teach you how to beat the new nclex's so-called attempt to 'raise the bar'.
If you're going to get a book, the one I would recommended is the Kaplan nclex
review. Unlike the others, it teaches you strategy on to how figure the correct answer most of the time, even if you don't have a clue when you first look at the question. The book gives some cool tips on how to study and how to pririotize if you usually have trouble figuring which answer to choose when all four of them in the multiple choice are correct. And those nagging nursing process questions (what is the nurse's best response...what would the nurse do first...) are also covered pretty well.
One thing I really appreciate about this book is that it tells you that when it comes to nclex, forget about what you would actually do if you were the nurse in a real-life situation. You can't be concerned about your other patients, or that you're falling behind schedule, or that you need help. Assume nothing that isn't stated in the question, and visualize yourself in a perfect-world scenario where you have everything you need, you're all caught up with everything that needs to get done, and you have all the time in the world to take care of the patient that the question is asking you about. Most importantly, always, always, always use Maslow's pyramid to prioritize everything. Stick to the stuff you learned from the nursing process textbooks and put all the things you've been doing at your job in the ICU out of your mind. For instance, you know that NO doctor or nurse anywhere in this world auscultates for bowel sounds in each of the four quadrants for 5 full minutes. Especially when the patient is in a crisis situation. But if auscultating for 5 minutes in each quadrant is an option on the test for a question about assessment for GI functionality, thats the one you'd better choose if you want to pass. How I wish I had had a book like this when I first started nursing school
The 2005-2006 version of the Kaplan nclex review is an excellent resource. It isn't yet available but I was able to get a pre-released copy and it is well worth the money. Plus, you get access to their on-line question bank which includes the new type of nclex questions. Better still, if your budget permits, you could also look into doing the in-class Kaplan nclex review. Its a bit pricey, but everyone I know at my school who did it passed the test the first time round.