We are new to CATs, since DS6 is in kindy, but I will say that this is something I've been trying to intentionally prepare him for when I knew he'd be assessed, as well as before he had the WISC interview. (His pre-WISC comment helped me to realize how much I needed to prepare him for the fact that he shouldn't expect to breeze through all the activities: "So, I'll play some thinking games, get them all right and then can we pick up a new book to celebrate?")
What helped us was that he was familiar with a computer program that uses questions to help find levels for users. He'd seen how it had asked him questions and then started him on level X and asked his younger sister the same questions and started her on an easier level. This has been our point of reference to remind him that the questions will keep coming until he's unable to answer them so that they don't underestimate what he's capable of doing. (Not so easy for someone who's used to knowing everything that's typically asked!)
