"What Works in the Classroom? Ask the Students"

One notable early finding, Ms. Phillips said, is that teachers who incessantly drill their students to prepare for standardized tests tend to have lower value-added learning gains than those who simply work their way methodically through the key concepts of literacy and mathematics.

Teachers whose students agreed with the statement, “We spend a lot of time in this class practicing for the state test,” tended to make smaller gains on those exams than other teachers.

“Teaching to the test makes your students do worse on the tests,” Ms. Phillips said. “It turns out all that ‘drill and kill’ isn’t helpful.”

http://www.nytimes.com/2010/12/11/education/11education.html