Poisoned Bonds - Julie Catherine - Bog

Mae Kingsley is a witch descended from the High Council witch coven and today is her first day of training at the exclusive witch academy.
The new class of students excel at their magical training, but the lessons are interrupted when a rival coven invades the town and starts a spate of magical forest fires. The High Council must stop them with an ancient ritual battle. Mae is unwittingly selected as a competitor in the head-to-head competition. With only four days of training, and a terrible handle on her secret witch powers, can Mae rise to the challenge and win the battle, stop the fires, and save her coven from certain destruction or will her future at the High Council combust into flames?
School's out. Rival covens will battle. Burn baby, burn.
The third hair-raising book in the teen paranormal witch academy series, the High Council Witch Chronicles.