I am currently a junior in a competitive high school in California (top 50). My gpa is around 3.67 UW and 3.88 W, but I have taken three AP classes so far, which is a lot for our high school since it’s hard to get into AP’s. I am aiming to to score at least a 30 on ACT. And I also did some volunteer work (60 hours CS) as well as participated in one of my school’s athletic teams for all 3 years. I really want to get into either UCI, UCSD, and my first choice USCB. I am just wondering if I have a good shot in making into any of these schools. (Preferably answered by students or alumni of UC’s schools) but any advices will help as well 
Your GPA looks on track so at the end of Junior year, calculate your UC GPA: https://rogerhub.com/gpa-calculator-uc/
Until you get a valid ACT score, it is too difficult to chance you. Keep up your EC involvement and do some test prep.
Repost when you have your UC GPA and test scores.