This is not a hard test for the average-to-above emergency medicine resident. It's pretty basic medicine, more focused on management and disposition of common presentations. Study up on the things you don't do as much of but that are "mainstream" (OB/GYN basics, ambulatory medicine things like USPSTF recommendations and secondary prevention for CV disease, DM meds) and you'll crush it. Use UW or the USMLE-provided case simulator (free!) to learn the interface for the second day -- it's more about learning how the interface works and remembering to do the things like "counsel patient" if they have smoking, drinking, risky sexual histories than about fund of knowledge, since the cases tend to be very bread and butter EM.