On the exam I took, Surgery was probably the lowest yield of all the subjects. They don't test you on actual surgical principles (like surgical techniques, various sutures, knots, instruments, etc). They test you on medical management of surgical patients. For general surgery, it pretty much is the same thing as GI in IM. I would spend a little extra time on Trauma, Ortho, Urology, and Vascular surgery, but FA, Crush, Q-book/bank, and more than adequate in those areas.