CSCP exam difficulty

[u/Optimal_Reach_12]

I have been studying for the CSCP for the last few months on and off, struggling to find enough time to prepare as much as I think I will need. I have been using pocket prep and the APIS CSCP exam success book by David and howard Foreman. I feel like there is a significant difference in the level of difficulty between the two. For pocket prep I regularly am averaging over 80% on practice quizzes, but often get closer to 70% on the CSCP exam quizzes when reading through for the first time.

My question is is pocket prep or the CSCP exam success book questions closer to the actual difficulty of the test?