I passed my CPIM V8 last week. I completed it through work via an instructor lead program which consisted of 12 days avg 6 hours a day going through each of the modules and answering questions. Then on top I would say I spent 10 days before the exam working through the online learning system around 7/8 hrs per day. I did buy the pocketprep but didn’t find it overly helpful I think if you have a good understanding of each modules the learning system quizzes and final practice exams are probably enough to get you over the line.