This is the 25th edition of the world's most popular medical review book! Trust 25 years of experience for the most effective USMLE Step 1 preparation possible. 1,200+ must-know facts provide a complete framework for your USMLE prep. Up-to-date test advice with focus on high-efficiency studying; Updates and revisions in all subject areas based on feedback from thousands of students; Extensive faculty review process with nationally known USMLE instructors; 500+ color photos and diagrams help visualize high-yield concepts; Expanded guide to high-yield study resources including mobile apps; Free real-time updates and corrections at www.firstaidteam.com. - Publisher.