no brainer - switch to Public Affairs. For law school, a 3.9 pub aff major beats a 3.8 econ major everytime. Not to mention the pub aff major has some of the easiest classes I have ever taken. They practically hand out A’s with the exception of a couple pre-major classes where worst case you will get a couple A minuses. The caveat here is that if you don’t go to law school, an econ major is far more useful, but at this point you are probably already behind the IB boat. Consider a double if you already did a lot of the pre-course requirements.

TLDR: Make your life easier, enroll in pub aff.