Do you do any after school enrichment or activities right now? It seems like maybe he needs something to take his mind off school for a little while - soccer or karate or SOMETHING. That doesn't fix the school situation, but sometimes having something going on that makes you happy can make the boring stuff easier to get through.

I highly doubt his other testing was a "fluke". It's pretty hard to accidentally score as gifted or a full grade level or two above your age peers.

~amy