More Clinical -- for board review, the standard is First Aid For USMLE Step 1 -- COMLEX is a tossup --- that exam has been so poorly worded that it's a inside joke. Don't blow it off -- I would recommend USMLE World for practice questions, take the USMLE first, then switch over to like Comquest about 2 weeks before so you get the flavor of the dorky way COMLEX questions are worded and then do Savarese (Green Book) practice exams (all of them) right before you take the COMLEX...you'll spank it....