I have heard quite a few instances where there is a big discrepency between Cogat & individual IQ. My own PG DS scored below the gift on his Cogat math and was therefore disqualified for ous school district gifted program. My friend's son who is PG too. Both he and my son have 30-40 points difference between their IQ and Cogat scores.
Unfortunately in some public school the gifted program teachers only believe Cogat and doesn't take IQ score tested outside of the school into any consideration. They believe that the Cogat scores can accurately identify the truely gifted kids because high Cogat scores always turn out high IQ scores in their experience. Just like my PG DD, she got 160 in Cogat.
