Dragon Academy by Devonnie Asher

Mistakenly marked by a stolen dragon, inexperienced Kaos is forced into the Dragon Academy—a brutal training school nestled in the heart of a volcano, where the country’s best dragon tamers are forged by fire.

Faced with grueling lessons and cutthroat competitions, her help comes in the form of her mysterious dragon, her two friends and a swoon-worthy lieutenant. But when she discovers that her dreadful past is linked to the Academy’s ruthless Headmaster, the stakes change.

Can she survive long enough to unravel the Dragon Academy’s secrets?