The exam (since October 1) is based on the revised PMBOK. If you buy Rita's book, make certain it is structured to the new PMBOK and not to the old one -- although much of the material is the same, there are enough differences that you should make certain your study materials are up to date.
If you're a member of PMI, check with the local chapter ... our chapter, for example, runs a 5-day (Saturdays only) boot camp at a discount (but you have to be a member of our Chapter to qualify).