I am a junior in high school now, but last year when I was a sophomore, my World History teacher put the wrong test score for my grade, which made my grade stay at a B+ for first semester. Until the day I got my test back, which was after first semester ended, I thought the score my teacher put on my grade book was my actual score. However when I got it back, I actually had a better score on it which would've brought my grade up to an A-, but I never said told my teacher because I thought the grade was unchangeable since first semester had ended. This was a huge mistake on my part and I am just realizing now that it is like a .5 GPA difference if I had gotten that A-. I still have the test with me and I was wondering if I could talk to the teacher or my counselor at the school or even the principal to change that grade, or is that not possible for them to do that?