Surgery is a tough shelf to study for
I'm sure you've all heard the dogma - medical management of surgical patients
The pestana review is pretty good though - ties together important points, and gets you thinking about those "next step" questions. Those can be hard because a lot of times all the answer choices are correct, and in a clinical setting all will be performed, but they're looking for the best next test/lab/imaging etc.
I did well on the shelf and was able to honor the rotation - Pestana definately helped. However I'd definately supplement it with something else (like NMS casebook or FA)