Took PMP a few months back and mostly used the Andy Crowe book for study plus some online resources... and failed.

Took it again today. Used Rita 6th Ed (read it once). Didn't read PMBOK. PMStudy practice exams (Was getting about 75% on those) and read over the reasons why I got questions correct / incorrect. Used Fastrack V6 also. As for study time... An hour or two here or there most evenings for the past month.