Unfortunately, it is not possible to reset the game.

If you really wish to start the game from the beginning, try playing Sorcery School on another account. However, before doing so, please take time to review your respective store's policy on personal accounts:

If you're playing on your mobile device and you're NOT connected, you can uninstall and reinstall your app to reset your progress. Beware that this action cannot be undone, hence you will forever lose your progress! Think twice before doing so!