At the start of this, I suggested that the school pre-test him for the grade 3 curriculum to be sure he had mastered it. They flat out said NO.
I am trying to find out where his RIT score is compared to incoming 4th. I haven't asked for RIT scores for those he'll be grouped with.
My fear with differentiation in the class is that his math teacher is his Spanish teacher... it's all taught in Spanish and she'll be struggling with many students anyway and not have much time to spend with DS8 let alone pre-testing each unit. In a perfect world, however...
I hadn't thought about faster vs. deeper. I know he's fast. He can master concepts rather quickly, has an amazing memory but again, not sure how one would assess deeper - maybe that he can apply those concepts to other new ones which allows him to learn those concepts on his own, easier, faster?
He is definately an out of the box thinker too... in our partial HS I have sometimes been amazed...
I thought the CoGAT non-verbal addressed this ability and that it roughly correlated to an IQ. We were recommended to not just do the WISC but also the WIATT (I think this was what it was called) for this purpose exactly.