The Step 1 prep resource no medical student can be without–revised thoroughly for 2021 Written by students who recently passed the USMLE Step 1 and reviewed and approved by top faculty, First Aid for the USMLE Step 1 provides the most high-yield topics and concepts found on the USMLE Step 1 exam. Literally every medical student turns to First Aid during their coursework, as well as during their Step 1 prep. Each annual edition is thoroughly revised, by bringing together the expertise and experience of numerous students and faculty. Students continuously praise the First Aid content, claiming “if it’s in First Aid, you count on seeing it on the Step 1 exam.” •Completely revised by students who just took the USMLE Step 1 and reviewed by faculty •1,400+ illustrations and photos •1,300+ high-yield facts and mnemonics organized into basic principles and organ system sections •1,000+ color clinical images and illustrations •Updated test-taking and exam-preparation advice •Improved organization of the pharmacology, endocrine, and reproductive chapters for more intuitive learning •Outline format allows for easy retrieval and synthesis of key information •Summary tables and comparison charts that improve consumption and retention of key information