Boarding schools with scholarships for autistic/struggling teens?

Brass tacks- 16 year old brother, has just. Given up caring. Has Aspergers. Refuses to do school work. Refuses to do any chores. Is destroying things and getting hostile and physical with our grandmother (71), who is raising him.

We’re at a loss. Removing his vices doesn’t work. Rewarding him doesn’t work.

He comes to my house 3 days a week after school and does SOME school work.

Leaves here, doesn’t finish it, and is getting hostile towards his IEP aides in school.

I need advice on programs, schools, intervention programs, ANYTHING to help this kid. Please.

I want to be a big sister again. And I want my grandmother to stop crying every week because she’s given up on life.