Does homework necessary?

All people have homework. Some students say homework is necessary and some students say homework is not necessary. I think homework is necessary.
First, to remember well, people have to review. Homework can be a review of studied material. Review is necessary to study well. Homework can be reviewed , so people can study well. So, I think homework is necessary. For example, if I had to attend academy today, I would always have an assingnment. So I can review it.
Second, progress of class can be fast when students study beforehand. So, when professors or teachers assign homework to study beforehand, they can answer what teachers ask, and they know quickly so progress of class will be fast and it is good for studying well
I think that homework is necessary for students because to remember well. People have to review and homework can be reviewed and progress of class can be fast when student, study beforehand