You cannot get a student visa while your I-485 is pending, at least not without abandoning that process. If you enroll in school, you will not qualify for federal student aid while your I-130 and I-485 remain pending. You will have to pay whatever tuition the college that accepts you charges for students in your situation - you can check and see what their requirements are, assuming you're applying to a state university, for eligibility for in-state tuition. I cannot promise in advance that no school will want evidence of your status, but many colleges accept undocumented students.

