Trying to study medicine for the surgery shelf is stupid. The "medicine" on the surgery shelf is almost all peri-operative management. What you have to know about is the management of surgical patients.
Know surgical diseases; know the complications of surgical diseases; know all the options for treating them, including non-surgical ones; know the complications of the different treatments. This stuff is well-covered in Lawrence (and other places). And know trauma: ABCDE.
Good luck.