Yeah I'm about 1/3 of the way through the textbook, and a lot of it is review from Physiology, Anatomy, and Biochemistry so far. It seems like it would be a pretty basic test for physical therapy students.
I'm still a bit surprised that some DPT programs require that you take the CSCS during school. It still takes a long time to study for it (unless you are really well educated in the field or have photographic memory), as the textbook is 600 pages, and PT school is already hard enough as it is.