I'm considering taking the exam. I would be using USP <797> and USP <800> as you indicated, which seem to cover nearly all of it. Also "the Courses in Sterile Compounding" 33-hour CE credit course from critical point. The bps website has the content outline which mentions specific organizations, which provide guidance on CSPs, so I'm going to make sure I know the regulations and standards each one of them promulgate that relate to the content on the outline. They are FDA, DEA, CMS, OSHA, NIOSH, USP, ISMP, CDC, ASPEN, ASHP, ONS, INS.
I feel like the content outline for the Compounded Sterile Preparations Exam is specific enough that it's actually a very useful tool to guide our studying. It sounds like it's geared towards a 503B facility, so if that's where you work, it should be straightforward. Of the people on the specialty council writing the exam, three are from hospitals, two from university, one home infusion, and one 503B.
Good luck!