I am an undergraduate math student. This fall, I wanted to enroll into a grad class. I have all the necessary math background to enroll (according to instructor). But last night, I got an email from him saying "He was told that only graduate students can register" This ruined my day because now I may not graduate on time because of my TA lab conflicts and other classes' time. My university's department is small and there are only few math classes and I have taken most of them already (if not all) The grad class was literally made for me. It was an analysis class that I was really interested in (plus I want to go to grad school!), it fitted PERFECTLY in my schedule, and I knew the prof very well (he knows me very well too. I've had class with him for 3 years straight in every term). I swear to god, this was destiny. This course was made so I could take it. I go to a university with two campuses. For some reason, on the other campus, they do allow undergrad to enroll into grad classes (there is a form). I am thinking about talking to our department head, but he might try to say irrelevant things (to change the topic) like "oh why don't you take this and that instead (like applied stats or something)?" when those other classes have almost nothing to do with my study (diff geometry). He did this once in the past when I was trying to find a undergrad advisor, but I guess he was trying to help. Anything you advise me to do? I am willing to go to great lengths to get myself into the class. Thank you for reading.