Are those exams a contest? Like, they will only take the best N percentiles? Because if not, you’re competing only against yourself and should ignore others’ grades
Ivy League kids tend to not be facing some extreme economic precarity. In fact a decent number of them likely have enough family wealth to not need to work a day in their lives. The others are unlikely to face too much trouble over a few Bs at Brown.
I did not go to an Ivy League but many of my classes at an alright school were graded on a curve and so C was average, B/D was one standard deviation above/below, and A/F was two.