The Faerie Ring — Laura Greenwood

When Frankie takes her sister's place at the ruthless and cutthroat Stonerest Academy, she finds herself competing against elite fae from all over the world. Desperate to keep her deception secret, Frankie has to manage to keep up with her classmates, bond with her new unicorn familiar, and try not to end up in too many sparring matches. No one said going to fae academy would be easy... - The Faerie Ring is book one in Stonerest Academy series, a modern fantasy academy series with a slow burn m/f romantic sub-plot.