Another voice confirm what master_of_none and Dude said. DD reacted similarly to Dude's DD, sweet and quiet in school and completely flipping out at home.
But no matter how it manifests, you need to step in -- and quick -- in order to help him. We were unsuccessful in advocating and ended up switching schools and then leaving school to homeschool. But no matter how it turns out, don't ever let the school scapegoat your DS and blame this situation on him.
I know a PG teen who didn't get help and has completely burned out. Funking out of school, belligerent and constantly in trouble, totally shut down.
