yeah If he were adult I would agree but he is a college student and his greast advantage ie. future knowlede seems to be useless . Do you really except in a realistic world pureblood would send their children to school without lots of extra education and as you can probably understand my world is au and more dangerous as well.

To some degree you are correct but One thing to remember is that the Mc has only been in the magical world for only 5 months and he has been trying and failing to do most basic things that at least he thinks everybody could do. most importantly He has no idea how powerful his Family's magic is Or how lucky or great he would be in the future (mainly in the context of recent failures). Of course, in the future, many other things about the teacher and would be revealed