Earlier quoted context omitted.
Why aren't high school class grades enough? If we want predictive measures then why not make the preparation for college the actual measure instead of tacking it on at the end as another exam. I can see it being useful for people who don't go through the traditional path and need to prove that they have the equivalent knowledge of a typical American high schooler but otherwise I really think there is no value in thes…
There are 24,000 high schools in the US (not even considering international students) with wildly varying grading standards. You have one applicant from Podunk City High School, valedictorian with a 4.0. Is that ... good? How does it compare to the thousands of other kids with 4.0s you have applying? I'm completely sympathetic to the idea that grades should be a better predictor of performance than one day of testing…
I want more people that study calculus and higher level mathematics because it is a standard part of their education and not because it is a requirement on some test. I don't care what grade they get on their exams because if I end up working with them I'm not gonna care about the grade but the fact that they learned how to think rigorously (or at least were given the opportunity to do so without having to waste effort and energy on playing status games).