You'll most likely get this at the end of Chapter 2 if you do only the Story missions and ignore the optional ones since you'll have 100% Bully respect at the end of Chapter 1 and you'll gain 100% Preppy respect at the end of Chapter 2.
*** Spoiler - click to reveal ***In the unlikely event you don't get it then, you'll definitely get it on completing Chapter 5 since all cliques will like you 100% then.