I wish I knew about this earlier, but if you have the time and plan on doing 2 banks of questions, either simultaneously or separately, do World and USMLE Consult (Elsevier). Kaplan is a worthless Qbank and a waste of time. The explanations to the questions are terrible and they don't test the material that's actually on the exam. They focus on stupid minutiae that is insignificant and I've also had blocks where one thing usually is over tested like anatomy or genetics. I won't even mention the fact that the questions don't resemble anything like those on the NBME's or from the actual exam (I'm going by what others have told me, including my sister). As for USMLE Consult, you can do a 30 question free test on their site, plus in their explanations, they cite the material in most of the review books that we use like Rapid Review, Goljan, Robbins, etc. You can also save the pictures and charts to your hard drive, or so I've heard 😉
As for the brachial plexus, that is actually very high yield and expect to have a couple of questions come up from that on your exam. I hear that most of the anatomy will primarily be the upper member (brachial plexus and musculature), lower member (again nervous and muscular), and I wouldn't be surprised if they threw in a hernia, some neuroanatomy, and my favorite, the eye 🙁
