The Last Graduate

"A budding dark sorceress determined not to use her formidable powers uncovers yet more secrets about the workings of her world in the stunning sequel to A Deadly Education, the start of Naomi Novik's groundbreaking crossover series. At the Scholomance, El, Orion, and the other students are faced with their final year--and the looming specter of matriculation, a deadly ritual that leaves few students alive after. El is determined that her group will make it out alive, but it is a prospect that is looking harder by the day as the savagery of the school ramps up. Until El realizes that sometimes winning the game means throwing out all the rules . . "--

Synopsis from Open Library.