<p>You won’t know until you try. What do you have to lose at this point? Instead of sounding like you are using Cornell’s offer as a threat though, I would use their offer as a cue that there may be miscalculation and ask them to take a second look. It will make a even stronger case if you can show that other schools’ EFC is also a lot closer to Cornell’s than NU’s (so this doesn’t just come from Cornell’s usual generosity).</p>