DD7's situation with a high CogAT (139) and a much lower WISC GAI (121) seems to be much less common that the other way around. In fact, I haven't found any other parents complaining about it online at all!
I actually know two families locally with kids who got 95th percentile scores on one piece of the CogAT (not composite), whose kids wound up with FSIQ scores on the WISC just a hair above 100. A mom on Mothering also said that she had a
similar result to that with her kiddo.
I really don't know what to make of it, honestly, and I'm not meaning to discount kids who score high on group tests or imply that they are all overestimations. I just am not sure that it is a good test for finding an IQ correlation for kids who are far away from the mean.
