I'm planning to apply for a M.S. in some Universities at the US, one of those I tried 2 times and failed (bad GRE scores). Now I reapplied, and got better results (Q:159, V:154, A:3.5), but not sure if it will put be in better shape than before. One thing I think it can be a diferencial is the fact I had an exchange program back at that university. Is it ok to send my grades to the graduate chair and ask if my application is competitive enough?