LOL - can you get him to start the GATE school next year? I would ask if he can be tested with 'end of 3rd grade' GATE program test to prove that he would be fine there next september.

Is he happy or unhappy with going to school each day?

Your son sounds 'way more' than just Moderately Gifted.
Do you have individualized IQ test info on him?

Best Wishes,
Grinity

Coaching available, at SchoolSuccessSolutions.com