Well, not sure if this is any consolation but I'm one of those kids who spent my last two years of high school completely not giving a shit, and now I have a Master's.
I was really depressed at the end of high school, to the point where I was doing the bare minimum and never showing up. I was late almost every day, and I had about three times as many absences as you were "allowed" to have. I barely graduated, but ended up getting into a few colleges anyway because my previous grades were good, and they also just weren't difficult schools to get into. I ended up doing really well in undergrad, and then getting into almost every grad school I applied to.
So it's not completely hopeless, but of course he does have to make it through. Is he in his last year or what?
Seems like he has stuff he needs to get sorted out before he goes to college, though (if that's what he wants). I ended up taking a year off to do just that myself, since I was still in a pretty shitty place when I started.