Call the CS dept and ask these questions, just say you are a prospective student. CS advising office, 379 Soda Hall, 510-664-4436, or via email at cs-advising@cs.berkeley.edu http://guide.berkeley.edu/undergraduate/degree-programs/computer-science/
According to the 18/19 CDS, 37% of those waitlisted were ultimately accepted (1,536/4,127, section C2). https://opa.berkeley.edu/campus-data/common-data-set
If this years waitlist numbers/outcomes are similar (a big assumption supported by no data) and you did not apply for financial aid, your chances are probably better than average. Of course you still need good grades second semester and good scores on any AP tests you are taking. Lastly, you may wait a long time to find out if you get off the waitlist----could be into July, even into August is not unheard of. Good luck.