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The University of California system could change the future of SAT, ACT testing.

SAN FRANCISCO — A battle is brewing that could result in one of the nation’s largest and most prestigious state university systems dropping tests that have long held the highest of stakes for high school students.
In the coming weeks, a coalition of advocacy groups is expected to file a lawsuit against the University of California, demanding that its nine undergraduate campuses stop requiring applicants to submit results from the SAT or ACT. The long-standing aptitude tests, the group contends, are inherently biased against the poor.
https://www.usatoday.com/story/news/education/2019/11/26/sat-act-test-california-change-testing/4310207002/
3 replies In the coming weeks, a coalition of advocacy groups is expected to file a lawsuit against the University of California, demanding that its nine undergraduate campuses stop requiring applicants to submit results from the SAT or ACT. The long-standing aptitude tests, the group contends, are inherently biased against the poor.
https://www.usatoday.com/story/news/education/2019/11/26/sat-act-test-california-change-testing/4310207002/
Replies to: The University of California system could change the future of SAT, ACT testing.
That research found that the (then) SAT II writing test was the strongest predictor among the common high school level (not AP or IB) standardized tests, presumably why they lobbied to get it included as the third part of the three part SAT of 2004. But it then took only a few years before test prep companies figured out how to game that writing section and teach weak writers how to score well on it.
But the relative weighting of SAT/ACT scores versus HS GPA does mean that "test score heavy" applicants to UCs are often the ones with disappointing results, because they assumed that the magnitude that higher SAT/ACT scores would compensate for lower HS GPA was higher than it actually was.
In contrast, some other schools weight SAT/ACT scores more heavily relative to HS GPA*. Schools trying to climb the USNWR ranking may do that because the USNWR ranking section for student selectivity weights SAT/ACT scores much more heavily than class rank. Ranking climbers may also chase National Merit finalists since those students are selected for very high test scores.
*Compare the frosh profiles for USC versus UCLA, for example.