I received a very low grade in one of my Master classes. This is not a failing grade but close to it. Such low scores are highly unusual in this country (Japan), 90/100 or more is the norm and even a 80/100 is frowned upon sometimes. My score is much lower. Therefore, although I will obtain the credits for the class, there may be prejudice.
The strange thing is that this class was anything but hard. It consisted in about a dozen of lectures, one every week, done by different scientists. The evaluation consisted in a very small quiz (A5 sheet) at the end of each lecture, to be answered in 10 minutes. Usually the question was: `what did you think of this lecture, and how does it relate to your research topic ?’. I would answer it normally, in a few paragraphs.
Because my final grade is so low, and because I was very surprised, I asked the responsible professor for the details of my marks. I would like to know how well I performed in each individual test. Unfortunately, he refuses categorically to provide me with this info. Is this legal or common behavior? What should I do?