Mr. Martin had been suspended from school three times this school year. The final suspension was for ten days. Ten days? Come to think of it, I have never heard of a TEN DAY suspension from school. Kicked out of school for two full weeks of classes?
I have no idea how a borderline student is supposed to keep up with his studies, or to improve his life in any way, while staying out of any contact with school for such a long period of time. The only possible benefit, it seems to me, is to keep his bad influence away from the other students.
It does happen, when they're trying to keep the rest of the students and/or staff safe. It also generally means that the student won't be welcome back, or at least not for long - they are on their way elsewhere to a more restrictive environment.