My hunch is this: If you homeschool your son for even one more year, he probably will be so far advanced that his achievement scores will accurately reflect him, even if the IQ scores never do.

As you say: How can we know what level Math he could be doing if he was never taught or shown or even exposed? If a Cheetah lives in a Zoo cage, and never runs at all, Is it still a Cheetah?

Love and More Love,
Grinity

Coaching available, at SchoolSuccessSolutions.com