How likely am I to get into a good school?

I'm a sopre in high school and am ranked 12th out of about 500. I do several academic extra curriculars such as Science Olympiad, Science Bowl, Quiz Bowl, Knowledge Master, etc. I also am President of Sopre Senate and was President of National Junior Honor Society. I am also in Student Council. I only have about 50 hours of volunteering so far, but plan to gain more in the next year. I just recently signed up for the Big Brothers/Big Sisters Program. I also partake in many student and leadership programs with the University of Nebraska Medical Center. I did above average on both my PLAN and PSAT tests. I have gotten one B+ in school so far, but besides that I have had all A's. Ideally I would like to go to University of California-Berkeley or Boston College.