If you change your mind about grades, you can change your transcript. You are the teacher and principal and administrator, right? And sometimes we get more information that can change how we assess a grade.
You can consider your classes and transcript "in process" until the point you submit it to colleges. Once you have submitted it to a college, it's hard to change it without having a conversation with them - AWKWARD! It's also difficult to keep things straight if you submit different transcripts to different colleges - NOT recommended. But up until the point of sending your transcript to college, you can keep changing and modifying and editing to your heart's content. I know that my transcript changed over time. Class titles, grades, and other details changed from freshman to senior year.
Changing grades is fine and easy to do - as long as you haven't already submitted the transcript to colleges. If you sent it other places (for private scholarships or insurance or whatever) that's not a problem.
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