This website will list all test optional schools: https://www.fairtest.org/university/optional
How poor is poor test scores?
Cal states admit by eligibility index and major so a high GPA could make up for a low test score.
Cal states use a capped weighted GPA with up to 8 semesters of honors points for UC approved Honors, AP, IB or DE courses taken 10-11th grades.
Here is the CSU GPA calculator and Eligibility index calculator: https://www2.calstate.edu/apply/eligibility-index
As stated above, non-impacted majors and campuses will accept in-state applicants with a minimum EI of 2900. So if he has a CSU capped weighted GPA and plug this into the EI calculator (CSU GPA x 800) + (SAT Math + EBRW), his EI without an SAT score is already 2880.
He should have plenty of options in-state depending upon his intended major.
Non-imapcted CSU’s include Channel Islands, Dominguez Hills, Bakersfield, Stanislaus, San Francisco State (most majors), Humbdolt (most majors). See impacted campus/majors below:
https://www2.calstate.edu/attend/impaction-at-the-csu/Documents/ImpactedProgramsMatrix.pdf