I'm new here, but you sound a lot like me, and your child sounds a lot like mine. We have no choice but to either homeschool (which I cannot do) or sit and wait until the fall (even private schools around here would not see DS until he entered K in the fall). I know that DS's Elementary School has several programs for kids that are advanced, bright, or gifted, so it's the only thing "settling" my concerns even though waiting is not one of my strong points.
Check with your school board (county/district/state), they may be able to provide more information than the principal did. Plus, they more than likely have mental health specialists on staff who are more informed about the specific test(s) and can assist you and/or make a recommendation for your DS.
Good luck.