I passed PMP today on the first try with 2P and 3MP. Some people say the real exam is easier than mock exams, but NOT! During preparation I went through Head Firts (once) and PMBOK (twice) + I used test questions from Rita, Headfirst 200, Oliver Lehmann and some other free sources. The real exam questions are very close to Rita's questions and in some cases they are really wordy with unnecessary extra information. 2 weeks ago and last week I took a day off from work and I took 4-hours tests. It helped me to judge how fast I can answer, how I can use my time.