Board Thread:Questions and Answers/@comment-24520051-20171203215353/@comment-1257201-20180521194804

Supergirl is correct! She graduated from Midvale High School in (November 1964).

In the Silver Age, Supergirl was the first major character to actually have character development. She graduated from high school before any of the Teen Titans -- even before Peter Parker (he graduated in September 1965). Supergirl worked in secret for several years until Superman approved of her going public, and even changed her secret identity name from Linda Lee to Linda Danvers when she moved from the orphanage to a foster home. There had been two-part and three-part stories from time to time, but Supergirl was the first character in the Silver Age to have a long multi-part story (from Action #278 to Action #285 -- eight issues in all).