this is what i used:
FA for surgery (only the "high yield topics" section)
Lange Q&A (did about half the chapters)
Pestana kaplan videos while following along in the pestana notes
Kaplan QBook questions (the questions basically test whether you were paying attention to pestana)
UWorld surgery questions
i also had lectures 2x/week and had access to online video case discussions (which i watched)
result: 91 raw score, 97th percentile ....even though i definitely walked out feeling like it kicked my butt
for the record i had not taken medicine (doing it now)
a word about NMS casebook: it sucks. if surgery is one of your first blocks (especially if you have it before medicine) DO NOT start with this, you'll learn nothing. you need to first know things before you dive into passively reading cases. start with FA so you can actually learn something then if you have time read some NMS.
Lange was total overkill, many of the questions were way too detailed compared to the shelf. unfortunately there just aren't enough questions out there and Lange is the lesser of two evils (i heard pretest is trash). just take it in stride and don't get too hung up on the questions you get wrong
the way you should be thinking when approaching every topic in surgery is:
1. what test do i do to diagnose the problem or what is the diagnosis?
2. what is the medical management?
3. when is the right time to do surgery? (whether it's a chronological time, lab values, clinical symptoms, etc)
...you will have questions about all three on the shelf
i've heard people say to study medicine concurrently with surgery or do medicine questions in UWorld. i don't think this is sound advice. it's the kind of advice people give in hindsight. it's not what they did but theoretically it's a good idea. however, there is no way you'll have the time to actually do this. stick to surgery-specific resources and you should be fine.