Presidio Junior High class of 1931!

Well, I found a picture of my dad's birth mom, Dorothy Wittmer, in the 1931 Presidio Junior High yearbook at the San Francisco public library! I want to find out more! I know that she completed 10th grade before dad was born, and I want to find out what high school she went to in San Francisco after leaving Presidio. If anyone can help, PLEASE let me know! She lived at 666 35th Ave in SF, so it would have been a school around that area, I think!