Changing a Mark From 9th Grade

Hi,
I had received a B in my 9th grade English class, but the teacher was willing to change it to an A. However, he never got along to it, and I thought nothing of it. However, I would like to get it fixed now, and I believe he would be willing to do it. I have already turned in all of my applications with that B on my transcript. If I were to get it changed I would be up to class rank 1 and have a 4.0 unweighted. Do you think I can get it changed and email all the schools with that update, or is it too late?
Thank you!

Colleges would be highly suspicious of such a change after three years. It would be a mark against you.

Okay, thank you. Should’ve taken care of it earlier.

Why would the teacher offer to change your grade to an A?

I wish my teachers offered to change my grades to A’s.