C.A.
I haven't read the book myself, but I heard the author talking about his book on a radio program and implemented some of the major points with my 13 year old daughter. Her grades are improving.
"Ending The Homework Hassle" by John Rosemond
"...if the child fails to do his homework, no one should get upset but the child, and no one should be inconvenienced but the child."
"Kids are smart, but teenagers are clever."
"It is a simple statement of accountability that proposes that parents should never agonize over a child's behavior if the child is perfectly capable of agonizing over it himself."
"It's about coaching from the sidelines, as opposed to getting swept up in the action on the field."
Read, enjoy, learn, implement, then learn more!