The School for Good and Evil by Soman Chainani

This year, best friends Sophie and Agatha are about to discover where all the lost children go: the fabled School for Good & Evil, where ordinary boys and girls are trained to be fairy tale heroes and villains. As the most beautiful girl in Gavaldon, Sophie has dreamed of being kidnapped into an enchanted world her whole life. With her pink dresses, glass slippers, and devotion to good deeds, she knows she’ll earn top marks at the School for Good and graduate a storybook princess. Meanwhile Agatha, with her shapeless black frocks, wicked pet cat, and dislike of nearly everyone, seems a natural fit for the School for Evil.

But when the two girls are swept into the Endless Woods, they find their fortunes reversed—Sophie’s dumped in the School for Evil to take Uglification, Death Curses, and Henchmen Training, while Agatha finds herself in the School For Good, thrust amongst handsome princes and fair maidens for classes in Princess Etiquette and Animal Communication. But what if the mistake is actually the first clue to discovering who Sophie and Agatha really are…?