In my PG DS's experience, there is 30+ points difference between Cogat and WISC scores.
His Cogat scores made him dis-qualified for our school math accelerated program. It was quite a shock for me. I talked to the gifted teacher. She told me that DS is lack of problem solving skills, critical thinking skill and blah... I really doubt it since DS played chess so well and was top 3 players in our state at his grade level. If he is lack of critial thinking skill, he would not be able to do it. Then I happened to talk to another parent of PG child who plays chess and has 30+ points of discrepency between Cogat & IQ. She suggested IQ test for DS. That is how we found out DS is actually PG.
