The CTS (I & D) Exam Guides
Exclusively from McGraw-Hill and AVIXA, the series of exam guide books cover exam objectives relative to each respective certification (CTS, CTS-D, CTS-I) with detailed coverage of the technical topics common to each job role.

Find more info here CTS Exam Guides (avixa.org)
Neither AVIXA nor McGraw-Hill warrants that use of these publications will ensure passing any exam. Practice exam questions were not subject to the same item development process as questions on the actual exam and may or may not reflect the actual exam experience.
Remember, though, you are not required to purchase any courses or resources to prepare for the exam.
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Thanks Greg. Having formed an independent study group for higher education AV tech managers wishing to gain a higher level of CTS accreditation, and completed the previous CTS-D study guide myself, I am planning to purchase the new CTS-D exam study guide and will be taking the exam as soon as I work up the nerve to sign up ...maybe at InfoComm.
Nice! Kudos for your ongoing professional development - keep us posted!
Is there any e-book available online?
Hi @Li Yi Wen, thanks for your question! Follow the link @Greg Bronson CTS-D provided above and scroll down to "More Help With Guides". You'll see "Book purchase is for either single print or single ebook format". So, yes!
I wish you the best in your CTS journey!