I had made the mistake in college some time ago of cheating on one of my exams and I have repented from my mistake.
1) Would it be recommended for me to retake that class that I had cheated in?
2) Would any money that I earn that is perhaps somehow related to me getting an “A” in that course be considered haram/illegitimate money?
3) Would any benefit that I may perhaps gain from getting an “A” in that course be a sin upon me if I do not retake the course?
It is enough to sincerely repent, and you do not have to repeat the course, nor will there be a problem with the earnings related to the course.