Help, Help, Help!!!! Brain Fade Going On!

I'm trying to remember the name of a book I remember reading back in the 70s or 80s about a post WWIII America where "we" had lost to "them" A new teacher comes into a classroom and her job is to indoctrinate the children into their new way of life. There is one little boy who refuses to go along with the program. How does the teacher get him to shut up and behave? She solicits his ideas and gets him to help in class. By then end of the school day he's no longer a problem.

It was a very short book and I seem to recall there being a movie made of it as well.

If anyone in LJ land remembers this story and remembers the name, help me out....please