I believe the problem is that schools end up pandering to the standardized tests, creating curriculum designed specifically to help students achieve higher test

I believe the problem is that schools end up pandering to the standardized tests, creating curriculum designed specifically to help students achieve higher test scores. This is bad because the tests have a narrow focus and anything not within that focus is deemphasized, or not taught at all. Other objections are that the tests are biased towards or against certain segments of the population and that they don't accurately assess the quality of education.