3.2 GPA is not good for community college. I would not apply to Northwestern or USC, just a waste of time and an application fee.
I’m gonna go out on a limb and say it was probably a bad idea to major in math at your community college, because I doubt the admissions committee will view it much more favorably than an easy liberal arts major. You could have majored in something easy and just changed your major at the university. Just bad planning on your part, and it’s kind of late to fix it. Not sure what to tell you…