No Child Left Behind is an abortion. The Department of Education was founded with the sole mission statement of raising national test scores. They have failed in stunning fashion. Currently, we are at a point where exceptional students are inhibited as they wait for the C and D students to catch up, which they never do. Funding is based on these test scores. Such is why rampant fraud has been uncovered and teachers have actually been found to have forged test answers to raise the average score of their classes. This is covered in depth in the book and documentary "Freakonomics." Now, students are not taught anything of value. Instead, they are exclusively prepared for tests.
The sad truth is that waiting for the stragglers hinders the progress of everyone. Education is not a team effort. Gifted children should advance faster than the laymen. Now, we have a socialist system wherein everyone receives the same mediocre education and ends up graduationg high school with no more knowledge than could have been obtained in a few hours at the library. Is it any wonder why the vast majority of college freshmen are deemed "inadequate" for post-secondary education by their professors and are required to take remedial courses that they should have already learned?