| Cornell/Princeton
Columbia/Harvard
Yale/Dartmouth
I don't know much about Brown and Penn... Cornell and Princeton seem to be the most academically serious (Cornell is "the toughest Ivy to graduate from" and Princeton has hardcore academics and uses curves in some (all? idk) classes). I think there is some inflation at Harvard, but students study a LOT according to the PR surveys. Yale has been accused of having generous grade inflation, and Dartmouth has a less competitive student body, it seems. I am just basing this on what I've heard, though. | 
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