Zodiac Academy 3: The Reckoning by Caroline Peckham

As the Vega twins, Darcy and Tory, approach their first major challenge—the Reckoning—they face increasing hostility from their rivals at Zodiac Academy. The Reckoning is a series of trials designed to test their powers, loyalty, and determination to claim the throne. With the Fae heirs doing everything in their power to sabotage them, Darcy and Tory must push their abilities to the limit and learn who they can truly trust. Meanwhile, hidden enemies and dark secrets threaten to unravel everything they’ve worked for. The twins must prove themselves or risk losing everything, including their lives.