Brother Charlie said:
Is this healthy? Is it normal?
Healthy is a relative term, as St. Thomas Aquinas would tell you.

Normal, another relative term. Philosophy aside, here's some theology to get you ...
You're not the only one to be apathetic like this, Charlie. I've struggled with something similar, yet different, lately as well. But do you want to know what I realized? As much as it would be easier to just stop doing homework, stop going to school, stop learning, that's not what you're called to do right now. Your vocation right now is to be a student.
God will make you holy not
in spite of your schoolwork, but
because of your dedication to school. He uses (and often places us in) our current situation to make us more like Him. And so do you know what that means?
It means that to reject this, to be unmotivated, is actually to reject God and the means by which He has chosen to make us holy. Not only that, but choosing not to give our best at school will likely mean limitations later on. Those are limitations for ourself, of course, but it also limits what God can do with us. And I don't know about you, but my current situation isn't frustrating enough to give up what I don't yet even know (what God might want to use me, His little creation, for).