Foul Is Fair by Hannah Capin

Hannah Capin's Foul is Fair is a bloody, thrilling revenge fantasy for the girls who have had enough. Perfect for fans of Karen M. McManus and A Good Girl's Guide to Murder. Golden boys beware: something wicked this way comes.

Jade and her friends Jenny, Mads, and Summer rule their glittering LA circle. Untouchable, they have the kind of power other girls only dream of. Every party is theirs and the world is at their feet. Until the night of Jade's sweet sixteen, when they crash a St. Andrew’s Prep party. The night the golden boys choose Jade as their next target.

They picked the wrong girl.

Sworn to vengeance, Jade transfers to St. Andrew’s Prep. She plots to destroy each boy, one by one. She'll take their power, their lives, and their control of the prep school's hierarchy. And she and her coven have the perfect way in: a boy named Mack, whose ambition could turn deadly.