Literally all my college friends were Ivy grads. Every one of them would tell you, “the toughest thing about this school was getting in.” And that was back when grading was actually tough.
I know this isn’t helping OP’s particular question. But my advice is not to worry about silly things. Just go out there and crush it. “How tough is the school, how tough is this particular class, how am I doing relative to others.” I can say from personal experience that I never thought about these questions for even a millisecond. Who had the time - there was so much to learn! Best of luck, OP, get out there and shine wherever you wind up!