UCB asks for Letters of Recommendation from a small percentage of applicants (some say random) and the rest of the UC’s will can ask for supplemental reviews again from a small percentage of applicants. If the UC’s do not specifically ask for Senior grades, they will not consider them.
As part of the UC application process, the UC campuses do not ask applicants for transcripts, portfolios, or other supporting documents. Applicants are expected to self-report their grades from their own transcripts, honestly and accurately. If a student is admitted and enrolled, the official transcripts are checked against what the student reported in the application. Any discrepancies can result in cancellation of enrollment.