“Go ask a competent posek.”
Ditto. And make sure to be prepared beforehand with a clear explanation regarding why you think you need to take this class and what your options are/aren’t.
Maybe also try to find other Frum people who took the same major in the same college and try to find out what they did.
And choose the competent Poseik wisely. On the one hand make sure that he really is competent – don’t just go to some liberal Rabbi who will give you the answer you want. At the same time, it might make sense to go to someone who is at least somewhat familiar with the college world and would be able to give you advice that is both halachic and practical.