UC’s have their own way to calculate and weight your HS courses from 10-11th grades. Most of the UC’s use capped weighted GPA (8 semesters of UC approved Honors courses). UCLA/UCB will also consider your Fully weighted UC GPA (unlimited Honors courses taken 10-11th grades).
http://admission.universityofcalifornia.edu/freshman/profiles/index.html
You really need to wait until end of Junior year to gauge your chances at a school like UCB. Right now you only have 10th grades available and no test scores. Yes, you if you do well Junior year, there is a chance but do not take classes just for the same of your GPA. If you have no genuine interest in a class, it may be difficult to pull out an A grade in the end.
Here is some target UC GPA and test scores to aim for in you are considering UCB and some of the other UC’s.
The Freshman profiles listed are from 2016 and the updated profiles will be available in August but it will give you an idea the competitiveness of a school like UCB. Again these are averages and intended major can make a big difference.
http://admission.universityofcalifornia.edu/freshman/profiles/index.html
And just to give you an idea of how your GPA stacks up to admit rates for the UC’s:
Freshman admit rates for UC GPA of 3.40-3.79:
UCB: 2%
UCLA: 3%
UCSD: 6%
UCD: 15%
UCSB: 14%
UCI: 13%
UCSC: 59%
UCR: 78%
UCM: 92%
Freshman admit rates for UC GPA of 3.80-4.19:
UCB: 14%
UCLA: 14%
UCSD: 44%
UCSB: 54%
UCD: 58%
UCI: 65%
UCSC: 85%
UCR: 94%
UCM: 96%
Freshman admit rates for UC GPA of 4.20 or above:
UCB: 42%
UCLA: 54%
UCSD: 87%
UCSB: 85%
UCD: 91%
UCI: 94%
UCR/UCM: 98%