Clinical Vignettes for the USMLE Step 1: PreTest asks the right questions so you will know the right answers This one of a kind study guides delivers: a format that simulates the actual exam, 450 board-type questions, referenced answers and explanations, and material reviewed by recent, successful USMLE Step 1 test-takers. With this one-of-a-kind test prep guide you will be able to recall key facts; get invaluable practice with 450 timed, high-yield questions; respond within the time restrictions of the actual exam; assess your strengths and weaknesses; review explanations of right and wrong answers; and build confidence, skills, and knowledge.