Because of my work load, I did not have enough time to allot on my PMP review sessions. Fortunately, the simulation exams in PM PrepCast were challenging enough to help me refresh my PMBOK knowledge. I also watched the free YouTube videos by Aileen Ellis to help me improve and memorize the ITTO. I also bought Rita's book two years ago - this is where it all started.
I find the questions in PM PrepCast more challenging than (and sometimes similar to) the actual exam. I am thankful that I subscribed to PM PrepCast and that it helped me cram my way to achieving the PMP certification.