GRE scores are a tricky tool to assess your standing. I scored in the 81st percentile in verbal and 61st percentile in quant, and the 54th percentile in writing (and am a US-born, white male, to boot), and I am attending a top 5. Every program treats the GRE differently, and sometimes programs will change from one year to the next. But don't get too hung up on "low" GRE scores; your success in all of the other stuff is probably a better predictor of your chances.