There has to be homework. There simply isn't enough time during the school day to get all your essays and stuff done. If you did remove it you'd have to increase the length of the school day by a significant amount. But that would hardly be an ideal solution. Having work which you need to complete in your own time is a valuable training activity, and it is essential that people get used to it, since any after school education and many jobs will also require you to do work after hours.