Flinstone- I studied for both at the same time. Minus the OMT questions, if you study for USLME, you're also studying for COMLEX. For OMT questions, Simmons' Osteopathic Manipulative Medicine Review for the Boards contains all the info you need to know. The downside is that Simmons only has a few test questions in it. I also used Savarese's OMT Review. It's a little less comprehensive than Simmons, but it has tons of COMLEX sample questions in it. Finally, KCUMB gave us about 4 weeks off to study, but I actually began in late January.