You can download all the materials that you need to prepare for the CCZT exam at the CSA site https://cloudsecurityalliance.org/artifacts/cczt-faq, after registration. However if you participate in the course, you can download all of them from the next unit.

The courseware kit can be a bit daunting. There are quite a few documents, and they don't all have the same relevance for the exam.

The overview mentions 7 topic areas and 7 domains, which correspond partially. The first three domains combined are chapter 1 of the study guides.

On the topic of SDP (Software Defined Perimeter), there is additional material in two documents. Those additional two do not seem to be part of the exam.

Finally, there are a few "Authoritative Sources" in the CSA courseware kit, of which the content is largely covered in the courseware. The main purpose of these seems to be that they can be referenced more easily in implementation plans than the courseware itself.

Oh wait, there is more! The internet is flooded with companies using Zero Trust as a marketing hook to sell their product. During this course, it is best to ignore all that. Work from strategic principles. Implementation will follow from that.