I suggest letting him stay with his mother and not forcing him to move.His fears would likely come true and he would resent you, his mother and himself. help him graduate but let him learn from his own life choices. It might be a great help to go through a online at home school to finish his hs. k12 http://www.k12.com/ is online public school that is free but he would still have to do the work on consistent schedule. ALC http://www.independent-learning.com/distance-program/ is a private school that does distant learning that would likely be more flexible so he would have a easier learning and be able to get his diploma sooner. good luck.