So You Want to Be a Wizard. The First Book in the Young Wizards Series Twentieth-Anniversary Edition

A mysterious library book opens the door to a world of magic and danger in the first book in the beloved Young Wizards series. Bullied by her classmates, Nita Callahan is miserable at school. So when she finds a mysterious book in the library that promises her the chance to become a wizard, she jumps at the opportunity to escape her unhappy reality. But taking the Wizard's Oath is no easy thing, and Nita soon finds herself paired with fellow wizard-in-training Kit Rodriguez on a dangerous mission.
The only way to become a full wizard is to face the Lone Power, the being that created death and is the mortal enemy of all wizards. As Nita and Kit battle their way through a deadly alternate version of New York controlled by the Lone Power, they must rely on each other and their newfound wizarding skills to survive--and save the world from the Lone One's grasp.