Princess Academy by Shannon Hale

Miri lives high atop a mountain where, for generations, her ancestors have lived a simple life, working in the quarry. But everything changes when word arrives that the prince of the kingdom will choose his princess from among the village girls.

A makeshift academy is set up on the mountain and every eligible girl must attend and learn how to become a proper princess. Soon Miri finds herself confronted with a harsh academy mistress, bitter competition among the girls, and her own conflicting desires. Being chosen could give her everything she ever wanted, but does Miri really want to leave her home and family behind for a royal life?