We have not found CoGat to have a strong correlation with other non-verbal tests on our DDs. DD11 scored in the 99th percentile on NNAT and scored only in the 79th percentile on CoGat's non-verbal subtest. DD9 scored 99th percentile on NNAT and had a WISC PRI score of 147 (153 with extended norms applied). She only scored in the 89th or 90th percentile on the CoGat non-verbal.
That's about the spread we saw btwn dd's verbal CogAT and her two WISC verbal portions. There was little to no correlation. I don't know; I guess that some of these tests are based on different theories of intelligence and the CogAT, like has been mentioned before, doesn't purport to be an intelligence test per se.
