The #1 selling medical review book in the world. This book manages to fit two years worth of medical school content into one review book....This book is extremely helpful in preparing for the USMLE Step 1 exam. It is concise enough to use to prepare for the exam in a reasonable amount of time without omitting important information. It covers the material covered in the first two years of medical school very well. Service First Aid for the USMLE Step 1 is the undisputed "bible" of USMLE Step 1 preparation. It provides a complete framework to help you prepare for the most anxiety-provoking exam of your career.