Surgery is a very practical subject, so actually performing surgeries is the ultimate goal. But, for the shelf exam, your focus should be on the indications, contraindications, complications, and post-op care of important surgeries (rather than the details of the procedures themselves). The questions will mainly make you apply this theoretical knowledge to clinical scenarios. Make sure you link common conditions to the surgical interventions you are reviewing; for example using visual maps. Following a premade study plan can help with organization of the material and help you use your time most efficiently.