Therapeutic Boarding School options for ADHD & Anxious 12 y.o.

Have any of you had to resort to this?  I feel so alone.  My DS refuses to do any school work and it is often a challenge to even get him to go to school.  He is very smart but also very anxious and feels overwhelmed easily and generally has a mindset of "I can't do it." 

Looking for Therapeutic Boarding Schools that are licensed for California...any luck getting funding from school district?  They offered me NPS but having trouble getting them to fund the places that seem like a good fit...(i.e.Cherry Gulch).