C's here are 60-69%, and thus not a very good mark. If they were 70-79%, I could see them as being OK.
I, personally, would consider a B (70-79%) a decent mark, and an A (80+) an excellent one, and that's something that I've applied to myself throughout high school and university (though we always go by percentage grades). C's are for classes I hate, and even then I'm disappointed in myself.
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