First, the RXprep exam setup is not really like the NAPLEX setup. However, it is still useful to help gain some random information and to review what you should already know. I recommend focusing on the main disease states and specialties including ID (Esp HIV & STDs), Heme/ONC, and psyc, as those are the areas they seem to pool the most questions for. Just do not waste excess time over studying an area you might see 1 question for like gout. I would say make sure you can hit at least 70% on the individual test sections and 100% on all calculations (including SDN 120).