How much do homework scores affect the overall grade?

There is no clear evidence that homework affects a student's overall grade, but there is evidence that homework may help improve standardized test scores. While homework grades carry some weight in the overall grade, there is no proof that homework, especially excessive amounts, helps with subject knowledge retention.

Students who do not retain what is taught in class have lower scores on quizzes and tests, even with a large amount of homework. However, consistent homework does prepare students to answer questions on standardized tests, because most homework assignments use the same format of question and answer as standardized tests.