Not sure how to reply to everyone, but switching classes/ taking different ones than you submitted in your degree plan is no issue. I'm taking three of the five classes I had planned, and NTAG couldn't care less. To Fighter-cat, just let them know. They'll work with you if you were selected already. I had a buddy change majors because he was already struggling along and was worried about dipping below a 2.8 if he continued, so he submitted a request and was ultimately granted a new plan.
But make sure you're communicating EVERYTHING and why.