It's a hard problem and anyone who says it's easy (including "just look at SAT/GPA!!") shouldn't be taken seriously.
The problem with SAT, GPA is that once everyone knows what you're measuring, they optimize for that measure, and it loses its meaning.
Of ten kids with no particular extra tutoring over what they got in their average public school, SAT and GPA are going to tell you a lot about underlying aptitude.
Have one of those kid's parents send the kid to a bunch of extra tutoring, and it ruins the ability to do the comparison.
Have every kid get all that exact same level of tutoring and it's back to an even playing field, but you've managed to ruin everyone's childhood.
And you might've beaten a lot of creativity and other useful-for-real-life but less useful for mass-produced-college-education skills out of them.
Today we're somewhere in between - well-off kids often get the helicopter-parent-study-to-the-test short-term-maximization childhood; less well-off ones do not.
So you need a new metric, or some secret sauce, but the secret sauce is only useful if it's secret. And if it's secret, it's hard to tell if it's legitimately trying to value the right things...
If we were starting schools greenfield it might make sense to just let them all do whatever they want, and then see how their graduates do, but... we're saddled with a lot of legacy shit from existing wealth, past wrongs, etc, that make that real tough.
And then some people put crazy expectations on colleges to do things like fix those historical problems, too, when in reality so much damage to some kids prospects are done WAY earlier: https://crookedtimber.org/2023/02/06/can-college-level-the-p...