I heard kaplan quizzes are tough and focus on things you never think of studying, everyone says they're much harder than the actual naplex. I personally like rxprep quiz bank, just buy the 30day access for $78, not too expensive, many chapters have TONS of questions so it is time consuming but if you can do well on them you should be good for the exam. Focus on brand/generics, MOA, side effects, DDI... doses and dosage forms are kind of impossible to study for, you either know it or you don't. A few days before the exam review the major topics: HTN, DM, Onc, HIV, ID, HF
Since you only have 1 more try, definitely give yourself at least 3 weeks to study... it may be overkill but i'd rather be over prepared. What helped me also is taking notes on things I didn't remember or I thought was an impt point on each chapter... BUT don't get caught up writing EVERYTHING down, it will take you forever. Just key points like major DDI and BBW etc and use that as a final review as well.
Like everyone has said before, make sure you know your math. Use the 120 SDN questions, if you're rusty with math then start with this review
http://www.theceinstitute.org/CE/f9f...s Review.pdf the rxprep quizzes for calculations are good practice, most questions on the naplex will be on par regarding difficulty, you may get a few difficult ones more consistent with the 120 SDN questions so I suggest using all 3 sources for your math studying.
Also make sure you know your statistics, they're really easy points, do the rxprep quiz for the stats part, its more than enough.