Of course high scores on a test are going to correlate with academic achievement, they are both just a measure of ability to pass tests. This is like saying peo

Of course high scores on a test are going to correlate with academic achievement, they are both just a measure of ability to pass tests. This is like saying people who swim very well will have high achievement in swimming competitions. The paper's summary implies that they should make testing mandatory, because when they made testing optional, they couldn't see the students who they'd like to admit. But they kind of ridiculously don't comment on the fact that mandatory testing might not make any difference at all. There must be reasons students don't send in scores when testing is optional. But just making the testing mandatory doesn't address those reasons at all. So there is no reason to conclude that suddenly applicants would start sending in scores at a higher rate. It's equally likely they would just stop applying.