Maybe, getting him into a class that can keep his interest alive.
Is there a way or, any possibility that you can take him out of the Government school?
Letting him feel like he is directing his own focus and his individual interests may be the key you are looking for.
My experience with government schools is that they force everybody into a square hole. Even the students feel pigeon-holed into doing or, learning stupid things.
Once he finds his special gifts he will be on the right path. Perhaps, learning to ride a unicycle will change his life. There are so many benefits to being physically well balanced. Playing sports come to mind. Becoming part of a team is also a wonderful self improvement shot in the arm.
Take good care,