This is a solid start! Honestly, the thing that makes me find this interesting the most is that is a modern fantasy setting that is still in its own fantasy world. I love that a lot, you so very rarely see people actually explore the concept of a fantasy world that isn't just standard high fantasy medieval era. I dig the various hints at what is and isn't common technology wise, like the main character not being familiar with using a phone really (the magic flipphone was an adorable detail) and even a powerful mage like the headmistress preferring cars for transport. I really am curious to see where this goes, because the potential for both worldbuilding and character development is realy high!