@inshm2016 check out the following link. Toward the bottom of the page, you’ll find info about IB credit at McCormick. I’m not really that knowledgeable about IB classes, but it seems that you need to take HL calc to get credit at NU. Again, my opinion is that of an amateur, so reach out to some people at NU if you want a real answer.
http://www.mccormick.northwestern.edu/academics/undergraduate/admissions/transfer-ap-ib-credits.html