Hi NM
As I didn't prepare using Rita's book, I can't speak too well to the resource's effectiveness, however I will say that you should be truly understanding the inherent concepts, processes and how they all work with one another, as best as you can, no matter what resource you're studying from. Memorization is not key to passing this exam, a full comprehensive understanding of all the processes is. The formulas are something you should be memorizing though, as they will be quite important to know during your exam. It took me months of preparation, along with failing on my first attempt, until I passed on my second attempt in October. Not sure what resource you're using to take your mock exams, but I would highly recommend that you purchase the PMP PrepCast Exam Simulator, as the questions are excellent (very close to the actual exam) and the exams are timed as well, just as the real exam will be. There are other choices out there you can choose from, but that's just what I used in preparation for my second attempt at taking the exam. Also, I can NOT stress enough that you should spend as much time reviewing each mock exam you take (all correct and incorrect questions) so that you can truly understand why you got what you got wrong, as well as further understanding why you got what you got right. The review alone is a great study tool, depending on what resource you're taking your mock exams off of. Again, PMP Prepcast Exam Simulator is great for this sort of prep!
Concerning scores on the mock exams, I definitely suggest that you get to the point of scoring nothing below 80% "consistently" on timed full 200 question exams (from a reputable source) before going in and taking the exam. Will this be your first attempt at taking the exam? The next few weeks will no doubt be very intense for you, considering the exam is on the 26th, however if you take heed to some of the suggestions above, it should surely help with improving your scores.
John
