USMLEBase. Com assists doctors for practicing USMLE Medical Entrance Exam. It provides Step1 QBank, Step 2 QBank & Concept QBank. It also offers Live Tests, Topic wise Tests, and Grand Tests. Social Wall, Performance Tracker and Study Plans are few add-ons of this USMLE Preparation app. As a USMLEBase user, you can get access to. Concept, Image & Premium QBank.