Report of the University of California Academic Council Standardized Testing Task Force:
https://senate.universityofcalifornia.edu/_files/underreview/sttf-report.pdf
Despite motivated reasoning, they cannot come up with a good reason to eliminate standardized testing. Here are the highlights for me:
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HSGPA + standardized test is better than standardized test alone, and standardized test alone is better than HSGPA (but UCs choose to overweigh HSGPA).
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HSGPA + standardized test is a better predictor of academic success than SES or ethnicity. R^2 is not all that different across income levels or race.
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Standardized test scores actually over-estimate URM performance in college.