Pageant titles, special awards won, school involvement, Prom/Homecoming Queen, sports played, those types of things.
Yes! Yes! Any special awards received from anything (high school and beyond) can be listed there.
I say high school and beyond, because I have seen registration forms with middle school accomplishments listed. Sororities are not interested in your middle school career. They want to know what you did during your high school years and college (assuming you are not an incoming freshman).
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Kappa Alpha Theta-Life Loyal Member