UWorld offers a (one block of 40 + a mini-tutorial). While limited, it gives you the real interactive experience. Use this to understand why the PDF is inferior.
Step 1 is a time-pressured exam. You have approximately 90 seconds per question. Practicing from a PDF removes the clock entirely. Students who rely on PDFs often report a rude awakening during their first self-assessment: they run out of time, panic, and score 20-30 points lower than expected. UWorld's timer trains your pacing. No PDF can replicate that. uworld usmle step 1 pdf