these GT schools actually avoid kids whose scores were above 2 SD because they would be harder to accommodate.
Many parents have reported the same experience.
If that is the case, where do our children go?
You mentioned that one of the schools to which your child was accepted "is able to accommodate highly gifted children (we saw it in their classroom) but we are hesitant to send him there because the school seems to be in unstable state." Are you comfortable sharing (or privately reflecting on) the "unstable state"... for example, is it a new start-up... a small school... or some similar "growing pains"... or has a serious concern arisen in the community such as impropriety of a teacher toward a student?
The opportunity to be in a school which "gets" your child and would accommodate his academic growth, and where he may meet intellectual peers with whom he may find things in common, bond, and form meaningful friendships... may be worth working diligently to help stabilize a gifted school.
Is this going to be the case from now on up to high school? How do you all do this?
It varies depending upon schooling options available in each area. If there is a viable gifted school option, helping to strengthen it may ultimately take less effort than years of advocacy with a school unprepared for children with your son's level of gifted, and where he may not find true peers.
Here is a roundup of crowd-sourced advocacy treads, posts, links and information:
http://giftedissues.davidsongifted....y_Advocacy_as_a_Non_Newt.html#Post183916