A Bat Mitzvah is a Jewish ceremony that most girls go through when they turn 12 or 13. You may have heard of a Bar Mitzvah, which is the same thing for a boy. They learn to read Hebrew and study the Torah, the Jewish bible and learn and promise to be good Jews. Check out the Lindsey AGOT book. However, I couldn't go to Hebrew school when I was 13 so I'm choosing to do it now. Many Jewish people do this.