I tried to look up what this is and the sites I found were difficult to read by translating. If you want advice on whether or not to appeal this, can you describe what it is? To get that rejection reason, it does not technically have to be a school, but a place that is “primarily focused for persons under 18 years of age”
If you don’t want to discuss, and were only concerned about not seeing the appeal, that is fine, too. But it is marked as an Educational institution on Google Maps