This character is a bad student.

A bad student is a student who doesn't try to learn and doesn't care about studying, is just really careless, lazy, and doesn't try when it comes to learning. Or they just are not good at studying, even if they are not being lazy and are actually doing their best.

Also, if someone has to go to summer school it would be a bad student. They also get a lot of D's and F's and never get A's or B's.