TA confession: I'm sorry, but most of your children (my students) are average

https://www.quora.com/How-does-the-difficulty-of-Stanford-grading-compare-to-other-prestigious-universities-like-Harvard-Yale-Princeton-or-MIT

According to Quora, Princeton gives about 35% As. So MIT is harder than Princeton and Princeton is harder than the rest. Stanford probably is the easiest of the bunch according to some of the posters in the above link.