Now, as for
preparation....
Keep the BoK close at hand, as it will very clearly layout the areas to consider and the fractional breakdown (i.e. how many questions to expect in what areas). Many of the ASQ certification BoK rely on common, foundational areas:
- General Quality Concepts and History
- (Project) Planning and Execution.
I wanted to call these out specifically, because if you borrow resources that others have used for different ASQ exams, material that covers
those topics will be useful to CQA certification. That is, those parts of a CQE primer will help just fine. Audit Planning will be something covered in the BoK, and you should study that specifically, but having a general understanding of project planning will be very helpful. If there is any difference between the academic study of audit planning and project planning, it is that generally audits don't "go wrong" (for the auditor!) so project risk management isn't as fundamental for CQA certification.
I also recommend the QCI primers, with one caveat (for ASQ certifications). The caveat is that the questions used in the ASQ question banks derive (or are supposed to) derive from
primary resources and not from
primers. This means that there will almost certainly be some small amount of terminology used in at least one question (or answer, or distractor) that isn't used in the QCI primer. There is no inoculation against this, you simply have to be widely read enough to have encountered the different terminology. This isn't meant to be a trap, it is more that the primary source used in the question bank may have used terminology that is consistent in its area but not common in others. Question writers have to identify their primary sources for questions and answers, and IIRC they are also supposed to rationalize the plausible distractors.
When I took the CQA exam, I specifically remember that for one question there was a term used for a type of sampling I had never encountered before (and was not in my reference material... and it was pretty rare in a post-exam Google search), but I recognized all the other terms as wrong answers. If a single question misleads almost all test takers in the same way, I believe ASQ essentially discards the question from that exam's results and flags it in the question bank.