The 150 questions released by Kaplan seemed a lot easier than the stuff I got on the test. If you haven't paid for one of the NBME self-assessments yet then you should do that. They're only $45 which in the grand scheme of things is really a drop in the bucket. I liked them because they gave you a printout of the subject areas you were weak in as well as your strong suits. That way you can focus your attention the last few days.
From reading everyone's experiences with the test, it also sounds like studying biochem, molecular bio, and cell bio for a day would help as well. I had a lot of DNA type questions on my exam so I wish I'd gone through more molecular bio toward the end of my studying.
I studied a lot out of Robbins Path Review book (with all the questions) all year during path. It really helped during that class. I spent most of my time doing Q-bank and only did maybe 4 of the practice exams out of Robbins. Looking back I kinda wish I'd done the other way around. Q-bank is nice but it tests on the rarest diseases and most off the wall minutia. Robbins stuff seemed more like the kind of things I saw on the real thing.
Hope that helps!