I've answered this exact same question before, but again, I say no, Pretest is not worth it for surgery. Most of those questions are just not the same type as the ones on the shelf. The shelf is mostly case based, you either make the diagnosis on a pt. who presents to the ER or clinic, or you make a post-op management decision (ie. what is the cause of a pts. fever on post-op day 3 and how should you treat it). HTH.