My son has not been able to fit in after we moved. I met with teachers and we tried many things, now I'm home-schooling him. He just wants to go back to his old school. Is he just going through a teen phase or could it be a cognitive delay of some sort that needs attention?
It is possible that your son has encountered a common social scenario: Cliques. As the new guy, he has not felt welcomed by his peers, but this is not so unusual. He may have incorporated the real or imagined rejection into a sense of self. Beginning around the age of 7 or 8 and lasting well into the teens and beyond, peers are a child's touchstone for self-identity. Most kids would be daunted by the thought of trying to fit into a new school.
Your son may have already given up trying to socialize. Nonetheless, if he is currently getting home-schooled, it is doubly important to encourage him to find a social group with which to bond. A local sports team or church or secular youth group may provide a social backdrop for him, and will help him cultivate the social skills that are as important as learning an academic curriculum.