After translation:

Wang Dan is a student of Peking University School.

? It should read:

? After translation:

He is a student in Peking University.

It is a literal translation of the school, not an auxiliary word. Koreans are used to calling it a big school, and of course it is sometimes called a university.

You can understand it in words.

20 days of study 12, neither slow nor fast. It depends on your acceptance.