To defend CPL a bit
- the QB's have a CPL only option which you set and it excludes the LO's for ATPL and drops the question amounts down considerably and covers CPL only, there are a couple that sneak through alright. Subjects like performace for example on aviation exam have 395 questions for CPL Vs 797 for ATPL, so its quite a bit in some subjects.
Problem is with the books, it is tricky to know what to cover and what not to cover, so you end up doing more than you should.