USMLE Step 2 Secrets Fourth edition by Theodore X O’Connell  MD.
 USMLE Step 2 secret is an Easy-to-Read review perfect for busy students like you. Theodore X. O’Connell, DM, author of several reviews and clinical reference books, has thoroughly revised this popular text, which presents essential questions and answers covering the important concepts you need to know to score well on the USMLE Step 2 exam: Key conditions you will be expected to recognize, all specialty and subspecialty topics, and necessary clinical Concepts