So I ended up reading step up twice, MKSAP3 once, and about 75% Qbook. Felt like the test was significantly harder then the peds and OB shelfs (probably not earth shattering news). I have to agree w/ previous posters that MKSAP3 was not that helpful. Questions were not particularly representative of the test and explanations were often just a couple of lines about some random study, rather than an explanation of the correct thought process or review of the relevant subject. Would still do Qbook, but know that these questions were easier as the the test is not going to give u a laundry list of classic signs/symptoms/findings. In the end, wished I had done USMLEWORLD like I did on previous shelfs, just didn't think I could get through all 1400 questions and thought finishng 2 smaller question banks would be more helpful. Will relay how it worked out for me when I get score.