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UCSD did an inquiry into the math abilities of incoming students. There has been a 30-fold increase in students not proficient at a high school level. 1 in 12 couldn't handle middle school level math. The average grade for these students in high school math classes was "A".
Link: https://www.wsj.com/opinion/uc-san-diego-and-the-crisis-of-education-f6332836?st=8zudJf&reflink=desktopwebshare_permalink