Errors and omissions is really the only hard part of the Wet Lab, as you may know it is wrong, but cannot determine the best option for why you would not dispense it. The compounding portion is generally a simple IV fluid, PO solution, or topical cream/oint.
It seemed to me to be more about who you get to grade you than what you do. I got a really laid back person and really only actually got a couple of questions about what I did, however, others I talked to got a more thorough line of questioning.