My experience giving academic assessments (like the WIAT) is that students of all ability levels tend to enjoy it for two reasons. One on one attention is one of them. Another is that the tests are designed so that you will have a few questions that are too easy, and a few questions that are too hard, but that most of them should be just right.
The school psychologist in my district was much more experienced than I was, and could give the WISC-IV very quickly. One thing I used to tell my test-takers is that they were the only kid in the class, so they should open or close windows and doors or turn lights on and off until the room was exactly the way they liked it, before we got started.
