It would be useful is there was a test on each subject like math, art and humanities, science, reading and language arts and so on. And this test would start from kindergarten level to questions all the way to college level questions and after the test we could find out what year level we are in for each subject (e.g. you might be in year 6 but based on the test you might have the math knowledge of a year 8) and what we need improvement on based on our mistakes.