I'm so sorry you're fighting this again. (((Hugs)))

Your son's scores are so amazing, so extreme! I'm surprised they keep blowing you off as if they can differentiate in the classroom. When my son was 1st grade and we were looking forward into 2nd grade, his school told me that math was not something conducive to differentiation.

If you're forced into homeschool because of academics, how can you get the social and structure components that you're concerned about missing?