Help with motivating a teenager

[Biciclista]

My sons were abysmal at the same age. My older son was failing almost all of his classes in 7th grade, and only continued to have an interest in going to school because he was in Band. He is a musician today.
It's true that your coaxing, threatening and bribing him is NOT going to make him want to do schoolwork. But if you're like me, you know you have to be proactive, because he's not mature enough to make these decisions on his own. I watched as some of my sons' classmates dropped out in senior year. And these weren't borderline Juvenile Delinquents, either, these were the super gifted kids whose parents decided that their children were mature enough to make decisions like that.
We didn't share that opinion, so when Son #1 quit going to health class in his senior year because he felt it was a waste of time (and you must pass this class to graduate) we threatened to ACCOMPANY him to the last 8 or 10 classes so that he would graduate. I guess he believed us, because he did graduate.
The humiliation of parents showing up in classes helps with some kids, but it didn't help with mine.
GOOD LUCK, until he's 18, you're the responsible one.

PS after both kids being slackers in high school, my younger son is now pulling nearly a 4.gpa in grad school studying pure math.
My older son graduated from college with honors, but did not do so well in grad school.