Get a good nclex book, I used saunders like a bible as I was rusty in content. I also used nclex 3500, pda, and had access to kaplan. I probably did about 4000 questions before my test, they actually help you studying, reading the rationales and all. I went over every system in saunders. Some say to do a lot of questions, which is true but you definately need to know the content. I studied practically everyday doing at least 50 questions a day.
Good luck to you, on exam day, really read the question and take your time, you can do it. I studied for about 3 months.