If you just want to get an idea of his IQ you could see if there's a MENSA chapter near you that will test him. MENSA testing doesn't give you as much detail but they can estimate his IQ for you, and because it's proctored it would carry some weight (as opposed to something on-line).
(I think an IQ would help to determine if he's just developmentally ahead temporarily or if he's actually gifted)
When I did the testing it was about $60 (this was a few years ago though). It took about 2 hours and 2 tests where given (one was the Stanford Binet and I can't recall the name of the other one). I'm not sure how it would work with children, but since MENSA accepts child members I'm assuming they'd provide testing, although I'm not sure which tests they'd use.
Regardless, though, what matters is his engagement... whether he's gifted or not. Can you enrich him after school? Give him material that interests and challenges him?
Best of luck - I hope you find a solution for your son.
Last edited by CCN; 03/24/15 08:33 PM.
