Download the exam guide from this page: VMware Certified Professional 7 — Desktop and Mobility Exam
The documents referred to at the back of the guide are used to validate the exam items - so whatever software versions the documents relate to is what you will be tested against.
This exam is really dated. With the announcement that "End of Availability of Mirage" was back in July of 2018 are there any plans to release a newer version anytime very soon? I want to take this exam but did not want to waste time on boning up on Mirage.
VCP-DTM 2019 is available - it includes exams based on Horizon 7.5 or 7.7