You monitor assignments ?. That is a lot of work for you and it is ultimately your teens responsibility to stay on course. I would encourage open communication so they can come to you if struggling. Some assignments are a small portion of the grade. My senior DD recently told that between her internship, other academic demands and her Acapella she did not put a lot of effort in one assignment due to minimal impact on grade. Explore what is going on then follow some of the great suggestions. Hopefully your teen already has good study habits.