UCB, UCLA, University of Washington, USC

I’m a sophomore in high school right now. I have a 3.4 GPA.
I go to an international school in Beijing and I take the IB program.
I have decent ECs. I am varsity in 1 sport and JV in another. I am also a part of multiple charity groups and the school coding club. (Is this enough?)
What are things I can do to improve my chances? Should I take summer courses? Get a job? Find more ECs?
I took the Practice Sats this year but It was the new version. I got 1350 out of 1520.

Depends on your test scores for all them. Hard to chance without them.

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To increase your chances, I suggest you bring your GPA up. While you might get in with a 3.4, a 3.8 is much more competitive. Joining more ECs won’t make a school accept you, but being a leader in them will, so try to get leadership positions in your sports and clubs.