Because that's inefficient. A class geared towards the bottom 50% of kids is going to waste a lot of time for the top 50% of kids. Simply giving the gifted kids

Because that's inefficient. A class geared towards the bottom 50% of kids is going to waste a lot of time for the top 50% of kids. Simply giving the gifted kids more homework just wastes more time, and hardly encourages them to reach their potential.