Download the Official Uworld Mobile App . With a legitimate subscription, you can download up to 25 blocks (1,000 questions) for offline use on your iPad or phone. The app retains the timer, the answer entry, and the explanations. You do not need a PDF; you need the app.
Over 3,800 Step 1 and 4,250 Step 2 CK questions that focus on concept application rather than rote memorization. Uworld Qbank Pdf