Congratulations on being a competitive applicant.
The UC’s are test blind so they will not consider SAT or ACT test scores when making admissions decisions or awarding scholarships. They may be used as an alternative method of fulfilling minimum requirements for eligibility or for course placement after you enroll. Note: SAT and ACT scores may only be reported in your application post-submission.
The UC’s have their own GPA calculation and consider all 3 UC GPA’s: Unweighted, Capped weighted and Fully weighted. As an International applicant, only AP/IB or UC transferable DE courses will e given the extra weighting in the GPA calculation.
https://rogerhub.com/gpa-calculator-uc/
UCLA and UCB will emphasize the Unweighted and Fully weighted (uncapped) GPA’s in their admission decisions.
UCB has been the only UC which has considered LOR’s but submission is by invitation only so no guarantees you will be asked for an LOR.
Although the UC application allows you to select an alternate major, both UCB and UCLA will only consider your 1st choice major in the original admission process. UCB may consider your alternate major if you are waitlisted.
Overall admit rates for International Applicants below:
UCLA: 5.8%
UCB: 5.5%
Specific Engineering admit rates for UCLA:
Aerospace: 3.7%
ME: 5.5%
Undeclared: 4.7%
Specific Engineering admit rates for UCB:
Aerospace: 4.45%
Industrial: 16.02%
ME: 7.42%
Undeclared: 3.67%
What the admit data does not show is how competitive the applicant pool was for each of the majors listed so both schools are in the Reach Category.
Best of luck and UC’s only offer RD admission.