Before the test was mandatory, people only took the test if they thought they needed for entry to college. Now there are more people who don’t want to go to college yet still must take the test. It’s logical to assume that the people who would not go to college or feel that the test is a waste of their time will not perform as well as the people who view it as a barrier that they must cross for their desired life outcome. The simplicity of the test doesn’t really matter.