The need of having done a class "formally" I'm (something like) a master student in Europe, now being in my first year and I have the following problem: Last semester I was attending lectures on QFT, but I haven't done the exam/assignments, since it was way too much for me that semester and since the class is not obligatory and I will have enough credits to finish my degree. Now I want to continue with subjects like QCD,SUSY, Renormalization,... The problem is not with the prerequisites, since there are none for these subjects. The problem is regarding a potential grad school application (for a phd). I mean, would it look weird, if I had taken the advanced courses, but not having a grade/exam from QFT? Do people look at this kind of things? PS: I'm sorry for the title, it will probably make it into the chart of most ridiculous titles on PF :).