Katja 7z - Brandis,
Katja Brandis (the pseudonym of German author Sylvia Englert) is best known for her high-stakes, shapeshifter fantasy series, which are popular with readers aged 10 and up. Her work typically follows young "walkers" who can transform between human and animal forms as they navigate secret boarding schools and environmental conflicts.
After the events of the first six books, Carag and his friends face new challenges as they mentor younger shifters while dealing with lingering threats from those who oppose their kind. The Wider "Walker" Universe
Carag, the cougar-shifter, returns as the lead character. Brandis, Katja 7z
Das Vermächtnis der Wandler (The Legacy of the Shifters).
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). Katja Brandis (the pseudonym of German author Sylvia
Clearwater High, a secret boarding school for shapeshifters.
Carag's Transformation (The Woodwalkers Book 1) - Amazon.com Clearwater High, a secret boarding school for shapeshifters
Brandis has built an extensive world through several interconnected series: