@NotUpToPar OK, I see only two small weaknesses within your control here - 1) your GC might not check the “most rigorous” box on your form and 2) subject tests could be better.
Beyond your control: Chinese male from CA, focusing on CS/STEM. There will be many students vying for top schools that fit this profile as @skieurope has already mentioned.
If it were me, I would not take the Physics SAT subject test. It’s been over two years since you learned this material in the classroom and chances are a freshman-level course is inadequate preparation anyhow. You haven’t adequately practiced/self-taught the material. A score of 550-600 will not help you at all. However, as you got a 5 on the AP Lang and Comp, why not try the SAT II in Lit instead? Or some other subject where your chances of doing well are better, even if it’s not a STEM subject? You can change your mind about the subject tests on the day of the test, assuming that the subject is offered on that day and is in the booklet.
TBH, with single digit admit rates at these top schools, nobody’s chances are very great. Spend some time thinking about your matches and safeties - make sure you consider UC campuses other than UCLA and Berkeley (especially for CS/Engineering where the bar is set even higher). Maybe take a look at Purdue, Pitt, Case Western, Rice, assuming affordability. Check out some public options in the Western states like ASU or UNM as admissions and financial safeties.