Clearwater High, a secret boarding school for shapeshifters.
The "7z" in your request likely refers to the in her overarching walker universe, which is the first book of the sequel series: Woodwalkers: The Return (Season 2), Volume 1: Das Vermächtnis der Wandler (The Legacy of the Shifters). Brandis, Katja 7z
Brandis has built an extensive world through several interconnected series: Clearwater High, a secret boarding school for shapeshifters
Carag's Transformation (The Woodwalkers Book 1) - Amazon.com Brandis, Katja 7z