There is a big difference between teaching kids who have a background and need some review and relearning and those who have no background and never knew anything to begin with.
It is impossible to teach a year's work in 4 months to those in the latter group. I have a class full of the former ones. There are lots of home works, good questions and A's. I love my class so much I almost feel guilty accepting a pay check.
(picture from Macy's, Herald Square)