I remember signing up for a class and taking a wrong one. Advisors are suppose to keep us from making these mistakes. Double check and double check, I remember all of that stuff and still I' d screw-up. That's why they have easers on pencils. The first thing I would tell me kids in school was, 'you are not going to learn unless you make mistakes.' So---- make lots of them your learn that's what school is about. Good luck.