If I repeat a course, will the old grade go away?

No. Both grades will remain on your transcript and both will be averaged into your GPA. Students in the College of Natural Sciences are not permitted to repeat a course for which they have already earned a C- or better. In addition, no student may enroll in the same Natural Sciences course more than twice without permission from their advisor, therefore students taking a Natural Sciences course for a second time need to be aware it may be their last chance to pass that course.