So, do you think he was given the CogAT (Cognitive Abilities Test) as others have wondered, or the CAT (California Achievement Test)? That would make a difference in terms of what they intend to do with the results.

The CAT is more like an ITBS test. It is a standardized, nationally normed achievement test and those are sometimes used for GT placements. However, the group ability tests are the ones I'd worry more about being used to discount the child's giftedness if they don't come out high.