Do you have A+ where you live? For us, A was very good but A+ was the ultimate! Interesting though because you're right that C is meant to be average but if you were a C kid you were kinda deemed... either "not trying" or just a bit thick. People felt bad about getting a C which, especially in high school, like teenage years (is college after high school? We'd call it university) is kinda rough! C is average, that's alright! You're keeping up! You can't be above average in everything but it feels like a lot of people were of the mindset that you had to get Bs and above in everything or you were "dumb".