FWIW, our school district only gives CoGat and NNAT results in percentiles so I'm not sure how the numbers correlate. 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.