Bronxmom, from my point of view it seems like you should seek help from a professional psychologist. It is not usual for a child to be that consistently defiant, or to have interests that get narrower and narrower, or to be unable to follow instructions at that age.
I'm so sorry you're having so much frustration. I'm homeschooling my 6 and 10 year old too. It sounds like you're dealing with behavior above and beyond what I'd expect even from a PG child. So I agree with the above. It sounds like maybe you need a professional eval. Maybe someone who specializes in GT/2E issues. Does he seem happy? Does he challenge himself in any areas? Does he enjoy other children?
If school needs to be a part of your life for everyone's sanity, then just find the best fit you can. If you're both miserable under the current conditions, that won't serve him well anyway.
Sending all the best to you and your family! Good luck!
