As mentioned the Official Study Book from ISC2 is not enough.
You have to read both NIST 800-145 and NIST 800-146.
Read the Cloud Security Alliance Security Guidelines Version 3 (the exam is not updated to version 4 yet)
Read the ENISA guide as well.
Do quizzes to get familiar with all of the topics.
For studying, I used
Having a CISSP certification and the experience of having taken that exam definitely helps with the CCSP exam taking. For actually passing the exam, I found that it was my practical, hands-on experience at work with private and public cloud setup and implementation, cloud strategy and governance, and cloud provider evaluations that made the difference.
Without the actual experience and the CISSP, the CCSP exam would be tough for a newbie (to cloud computing) as it requires application of knowledge that is not available through book learning. An instructor led class would be necessary in such cases IMO.
Planned for 6 months of intensive preparation.
**At this time I booked the exam, put skin in the game because I was quickly losing motivation at this stage.**