“You know this how? It’s a common refrain.”
See Tim Groseclose’s tell-all account, with the actual raw admissions data - the scores and demographics across dozens of dimensions on each of, iirc, ~70,000 individual UCLA applicants - of how the UCLA adcom of which he as a professor was a participating member fudged the scores for large numbers of applications to achieved desired race-based outcomes.
The name of Groseclose’s book is “Cheating.” He posted the data files to his blog. You can download the data and see for yourself the “before” and “after.”