Judging from your present certifications, you already have a good base of knowledge.
What I found from the CSCS exam is that they dive right into scientific questions such as the proper VO2 Max for a male swimmer. I would suggest, if you don't have already, the updated edition to the Essentials of Strength and Conditioning textbook that can be found off of the NSCA website.
The text has many practice exams that you can take to prepare yourself for every subject available at the end of each chapter. Also, they have practice exams and quizes on website. check it out.