Anything toi want... journal entries, taking notes in class, doodling, écriture stories, songs, ou poems, écriture things down that toi don't want to forget, keep track of your favori quotes, use it to make lists, make paper airplanes... the liste goes on. :)
Maybe a diary, ou maybe notes for school ou for hobbies like if toi write. ou maybe toi can use it to draw, that's what my cousin does. Just doodle with it. Use it to do your homework on. Anything toi want!