2 techniques worked well for me: notecards and Rita Mulcahy's PMP Exam Prep book.
Notecards: By outlining each process group and their respectives components on notecards, I could quickly and easily review each process at every study session. This resulted in expeditiously identifying which PM process the questions were refering to during the test.
Rita's book: Complimented the PMBOK very well, giving examples and illustrations of the various topics. Helped me to better understand PM concepts.
Thanks and good luck!