I used to teach high school and have reservations about these mail correspondence courses. By finishing his credits this way, will they meet your state's requirements for graduation? What are his plans for after high school? Has he considered maybe going to night GED courses? No matter what he decides to do, that high school diploma will matter.

Have you spoken to anyone at his school about this...one of his teachers, a guidance counsellor, the principal? Has your son told you why he doesn't want to go back? Have you noticed any change in his grades recently?

The only thing I can recommend is that you carefully look at his (and your) options before making a decision. I would hate to see him compromise his future.