How does the nerdy girl end up popular?

How does the nerdy girl that no one notice end up popular? Meet Cas the girl that's under everyone's radar. She has never had a boyfriend only has 5 friends (she's a bit socially awkward). Cas doesn't realize when she agrees to help the Star Quarter Back Mason Swift with his History homework that her life is about to change epically. People start to notice her, guys ask her out every hour, girls are begging her to hang out with them. But why? Is it all because she help Mason? What did Mason tell them?