The main study material I used was from vBrownBag from youtube they have about 10 videos covering this. It is for vsphere 6 but all of it is still relevant. Watch it twice.
https://www.youtube.com/watch?v=vgKTiWvKGM4&list=PL2rC-8e38bUXAB-VaBem953POgFDrk-Iw
The other material I used following the below links
1.
2.
3.
Really spend time on the below
Conceptual, Logical and Physical designs
Requirements
Constraints
Assumptions
Risks
Functional requirements
Non-functional requirements
Availability
Manageability
Performance
Recoverability
Security
Enjoy I hope this helps and good luck
Alexandra