If you don't pass it this spring semester you or you THINK you might not pass a prereq, you better call the school and ask them when their deadline is for turning in final transcripts. Some schools will have deadlines that come before summer courses end so if you fail, you won't be able to retake and meet their deadline. At least that's how courses were at my school. If you are borderline, suck it up and study harder. Don't get a W. Take a chance and just maybe you'll pull off a C. If not, retake. Don't just give up now because you'll lose that chance all together.