I've had my PMP for about two years now. I agree with most above - the PMBOK alone is not sufficient to pass the exam.
Learn all the EV formulas; study precedent diagrams, especially critical path, slack, lag, delay, etc.
A number of questions on PM theories, social interaction and behavioral theories. got to remember who said what. Learned it, forgot it.
I took the on-line version of the ESI couse. About $800; spent 2 weekends on it, and crammed with the flash cards, then took the exam. Expensive, but my company funded it. You may need more study time, or less than I. Some spend months on this stuff.
Keep one thing in mind. The PMP test is Pass/Fail. Unless you really like studying all this stuff, a pass is a pass. The passing grade changes each year - I believe its set so that a certain percentage of folks will fail, something like 45% the first time through it, but don't quote me. When I took it ( December, 2001), passing grade was 70. So, you don't need to study to get a 100% -
G'luck