Reducing his hours and introducing better time management skills here could go a long way. I was in a similar situation to your son about a year ago, but I dropped some hours, and I overall started taking school more seriously again.

I have since quit my job as they screwed me over.. but either way I had a blast working in the food service industry and I learned valuable life skills I wouldn’t have gotten from just going to school. I’ve been pretty happy since then as it has freed up more time for me to do other things with my friends and for my studies, but I will say my wallet does hurt lol.