Hi I wanted to get a year subscription of Combank or Uworld for step 2 and do it as I am doing rotations. I didn't find Combank useful for my Comlex Level 1 and was wondering if I should buy both (because I don't know how much OMM is on the shelf exams). Does anyone know if I should get either of them or both? Also any other way to prep for Shelf exams?