"It's GPAs Not Standardized Tests That Predict College Success"

Researchers at the University of Chicago compared the relationship between GPAs and SAT scores with college graduation rates, and found the former had a much stronger correlation than the latter.

…The findings suggest that effort put into coursework is more effective than preparing for standardized tests, said Kallie Clark, co-author of the study and a doctoral student at the University of Chicago.

I didn’t look closely, but the study is here: