I agree with using the remote apps like Team Viewer & iTeleport works fine.
But i was tinkering around the web and found a 'java supporting App' called 'CLOUD BROWSE' if you buy it, you can access the Usmle-World Web site and download the client directly onto the iPad (THROUGH BROWSER ONLY) You can access the client and start doing the questions. Find UWorld software downloads at CNET, the most comprehensive source for safe, trusted, and spyware-free downloads on the Web.