https://admission.universityofcalifornia.edu/response-covid-19.html says:
University of California:
Is UC making any adjustments to account for the cancellation of spring ACT and SAT tests?
Yes. The University recognizes the challenges that students are facing due to the COVID-19 pandemic and, in response, UC is suspending the standardized test requirement for students applying for fall 2021 freshman admission.
Students applying for fall 2021 are not precluded from taking standardized tests (SAT or ACT) and sending scores if they are able. Doing so can support their statewide UC eligibility, application for certain scholarships, and help them fulfill some University graduation requirements. Campuses will adjust their internal processes accordingly to ensure that no student is harmed in admissions selection should they not submit a test score. This modification to the test requirement is not intended as an admissions policy shift but is rather a temporary accommodation driven by the current extraordinary circumstances.
This page also has information on how Pass / No Pass grading for this spring and summer courses will be considered for those who will apply to UC and those who have been admitted to UC contingent on in-progress course work.