Re: #20
Some UC studies of HS GPA, SAT, SAT subject / Achievement, and other factors with respect to college GPA:
https://cshe.berkeley.edu/sites/default/files/publications/rops.geiser._sat_6.13.07.pdf
http://senate.universityofcalifornia.edu/_files/reports/CAIR%202007%20-%20Prediction%20of%20UC%20GPA%20from%20New%20SAT%20with%20Tables.pdf