So, I have accepted this, because you seem to have asked a genuine question. The reason you have homework is for the development of knowledge. Education is as defined: The action or process of teaching someone especially in a school, college, or university. Homework is part of the curriculum designed by the teachers for your benefit.
Yes, it might not make sense, but education prepares you to improve yourself, and handle the professional environment of a workplace. No, it isn't always fun, but it is essential for you if you want to achieve certain goals in life. Yeah, I understand that school might suck for you, but if you apply yourself, you will set yourself up for success in the future, which is good.
Well, I have no clue why my opponent did not further expound on his dilemma, and I tried to apply some logic to what he was trying to say. He did not state that he wanted to argue about the need, or lack thereof for homework. Such is life. It is part of your education, and be thankful you are given the privilege of education, which is a privilege that some are unable to enjoy. Good luck.