PreTest is the closest you can get to seeing the test before you take it! Great for course review and preparation for the USMLE Step 2 Clinical Knowledge (CK) and shelf exams, Surgery by PreTest puts everything you need to know right at your fingertips. Install the free version today and jump-start your studying! We have provided a limited free version of the app that you can try before deciding to upgrade. This version includes a limited amount of practice questions and basic progress metric