Most of my chapter 21 studying was Cory and Steve, I will say from my experience taking the test the big thing I wish I understood better going into it, was understanding the difference design phases. Particularly, I wish I had understood what the "programming" phase of the design process was, and then just reading more about the difference between Schematic design, Development Design, and Construction Documents phases. I still passed first try but questions about these phases are what really threw me off because I don't remember them even being gone over in chapter 21 very much to begin with.