Honestly, if I were you I'd get his IQ tested and a full cognitive test to see what level he is at in all the different areas. Since he's pretty different from other kids, maybe look into gifted programs where they can support his brain more? Often times gifted kids can have learning disabilities attached with it, so it helps to get a full map of things. That way too you can look into getting him into a more specialized program. You have to also look at from the prospective of a teacher, they need to teach for the masses of the bell curve so it's harder, especially with class sizes, to get more individual attention on either side of the extremes. This will lead to more behavioral issues in kids who need to be challenged more, so it's not really a good environment for them. Your school should have the resources to do that, either at the elementary or at the high school in your district. My high school had a psychologist who was able to test me. (I only found out in college how weird my brain was when I had to take that test because for the life of me I can't learn a foreign language, since how I learned my native one isn't how other people learned it. My brain memorized everything so I don't see parts where other people can see parts. (It doesn't have a name, wish it did then explaining it would make a lot more sense.) My ranking for that part was low, but on every other test I scored really high on, so where a lot of people have learning disabilities on the higher end, mine is on the lower end. It's all part of being strange I guess. lol) If I had known earlier though, I would have had more help and also let's face it, anyone who is a little different tends to get bullied a lot. So it helps if you're a different person around other people who are different too. I went to a private college and there I was more average, but still the effects of my childhood like that made it hard to get close to people. I'm better now, now there's a lot more awareness, however, it still happens. So make sure that you watch for those signs because sometimes kids hide it thinking it's their fault. I hope this helps.

Edit: Also, sorry fort the late reply, with young kid things I tend to want time to think more so that I give the best reply I can give.