If you're already in socsci, you can transfer to another socsci program no problem. You just have to meet the course requirements. Transferring across faculties is harder.
The Mac polisci department gets very politically radical after first year. The problem is that nobody is going to give you a job just because you can critique imperialism and list all the sins of white people. You will also have to be very good at writing essays, they do have high standards.
It sounds like you want to quit PNB just because you're scared of calc. Adulthood, employment, parenting and so on will all demand of you that you become good at things which make you uncomfortable and which you're not initially good at, so you may as well start improving your character today with a calculus class.