Hello! I received a scaled score of 990 on my GRE and a percentile of 94. Can someone explain to me what the scaled score means and out of how much is it. Also how good is the score for applying to top rank universities (Caltech, MIT, Harvard) i.e. I want to take the math GRE too, even if I go for a phD in physics, should I take the math one or retake the physics one (I have only one time slot for a GRE, before I apply for grad schools)? Thank you!