You said hes right now doing 10 hours a day and his picking is so bad ??

Then why is there even a question that hes overwhelmed and things need to slow down NOW ?

College is years and years away. Maybe once he is done with high school he might not even want college and find a wonderful career on his own and not be bogged down with student loan debt until he's 50 years old.

I understand that you have had this plan for him, but plans need to be adjusted all the time for all kinds of reasons, Life is life, ever changing.