@AsianTrackGuy Also, I can chance you real quick.
So, there’s a really nice source to see what were the GPA ranges for transfers in each UC for each major. Just select the options you want and you’ll see all of the results from previous years. The link is here: https://www.universityofcalifornia.edu/infocenter/transfers-major
Anyways, based on that source, your GPA is a tad on the lower side. However, it is still a competitive GPA. Also, you have great extracurriculars. Custom building something and having a Google research opportunity definitely makes you stand out, even if it was brief. Having an incomplete IGETC is okay, but it comes into effect if you do get in and they start assessing for GEs and stuff. Overall, you are a pretty good applicant. Mathematics is definitely a selective major, but as long as you did well this semester, you should be good.
Did you put down an alternative major just in case?