To maintain USMLEworld (UW), one would have to keep paying for the subscription. A three month block, I believe, costs $249, so it would cost you about $1K to maintain UW all year round. Plus, you'd have already gone through all of the questions by the time Step 2 came around, so it would be harder to receive any additional benefit by using UW (though, in theory, you'd already be wellprepared). I think it might be better to use the Pre-Test books for each M-3 Clerkship than to use UW as an M-3. You can get some nice deals on used books (i.e. Pre-Test, First Aid) from amazon. I, personally, would recommend the First Aid for each Clerkship, though you may be somewone who prefers Blueprints. Then, you can supplement your reading by doing questions from Pre-Test. One source that, in a sense, combines text and questions is the "Case Files" series, published by Lange. There should be one for each Clerkship. I think your idea may work in theory but, at the end of the day, you'd probably be better off using FA + Pre-Test or maybe just Case Files for each Clerkship. That said, you are correct in that knowing the M-3 material well will go a LONG way in succeeding on Step 2. Hope this helps; you can PM me with any additional questions. Good luck!