The competition is extremely hot in these universities....and u will have extremely heavy pressure...
Some of my friends told me if u do PHD in these universities, u will do GRE test and sometimes, GRE sub test for like physics and chemistry...
Meanwhile, U will prepare to work in the atmosphere of Chinese language...since soooo amny Chinese students get full scholarship in these American top students...and u find all ur classmates speak Chinese in the lab...
And to be honest, they r much better at math or logical thinking than others...and more hardworking...
So if u choose to go there, u need to work hard...and delete most socal life to keep the scholarship...