If you are in school you should ask about challenging or testing out of a class.
It is generally an easy thing. Talk to your academic adviser and tell them you have experience outside of college. If they won't let you challenge or test out of a class, ask the department head. Explain what you have already done that shows you know the material.
Be prepared to take the exams from the course, and pay a small fee.
I managed to test out of several courses. I just rechecked the costs at the school and they are unchanged; the cost was $100 to take such a test, and if you pass, another $10 to the school registrar's office to record the course grade and mark it on your transcript.
Many people will test out of general education requirements, and many smarter experienced individuals will test out of first-year and some second-year classes.