That depends on his parents and the law. He can probably get involved in a local homeschooling co-op or move to an online school to take the burden off of them, but they would still have to become far more active in his life. I hate to say it, but they might not be willing or able to go that far for him.
All in all, no matter what he does, he will be relying on others. There is some risk. Is he, as a person, willing to take it?
Rapier is right. He might need therapy even if everything calmed down at school.