if his course is a full time course then no, in my opinion you shouldnt be badgering him. I left home at 16 and went to college at 18 and as a result of less than supportive parents i had to also work, i would get up at 7, college for 9, finish at 4:30 in work for 6 finish at 10 home at 11:30. the two took up my free time, i was constantly knackered, utterly miserable and in the end my education suffered as a result.
if its a full time course then 1, you should be happy he is in education, 2, he needs your support, hes a teenager, let him be one.
remember, his work load will only increase over the duration of the course.