Easy one to me. Let him drop and strike that iron while it is hot. You do realize public school is just tax payer funded daycare so grown ups can go to work in a post industrial revolution society? Some type of education and socialization was an additonal feature to justify those taxes, never the primary purpose. You did a good job getting him to a great place. Give yourself a pat on the back and let him fly! GED or Diploma will mean nothing in 3 weeks later.