> This observation does not lend much credence to the idea that grades are "highly predictive of ability" or that people with low grades "often struggle a lot".

> This observation does not lend much credence to the idea that grades are "highly predictive of ability" or that people with low grades "often struggle a lot". The paper does not seem to control for differences between colleges. It's unsurprising that the predictive value of, say, 3.8 GPA would massively differ between individual schools.