Welcome, Jeni! Those are great scores for your ds.
With a 7yo, I'd hesitate to put him in with sixth or seventh graders, even with that IQ and even with those achievement scores. We recently moved my 6yo from public K to private gifted first grade, where he's subject accelerated to third grade for reading and math. Although he could probably move somewhat faster, he's pretty well placed there -- even though he reads quite a bit higher for pleasure and grasps math concepts very quickly, he's still learning a lot. Things that don't come naturally to a young child, like *critically* reading, or *gasp* reading the instructions! It's a big jump between a second grade curriculum and a sixth -- and there *are* steps in-between, even if your ds has the down-and-dirty basics. If I were you, I'd go and observe a fifth or sixth grade classroom, and see what you think!
We've had great success at the private gifted school; ds6 is *much* better placed academically and socially there than he was at his public school. He's meeting tons of kids who are more like him, and a few that are actually very much like him -- a situation I doubt he would have found before high school had he stayed in the public school system.
Homeschooling isn't an option for us at this point, but I think we've found a pretty happy medium for now.
Good luck, and welcome to the journey! And yes, your ds is *that* smart.
