"The biggest correlation in scores of test is your income, and how well you do is dependent on your income which means that you have been trained for the tests, and the training for the test comes from privilege" - Leon Botstein of Bard College
Obviously studies have shown that teachers are teaching the test material rather than what's important. Corporate testing helps define how much money are school district gets based on "performance" and the poorer school districts are not going to do as well, and will lose even more in funding that what they already lost.
Students have the power to boycott these subjective tests and they should.