<p>Personally, as someone who took the GRE last year, I think it’s absurd to suggest that it’s a great predictor of success in graduate school. Success in graduate school has so much to do with nonacademic factors – do you care enough about your research to stick it out, did you choose a good thesis advisor, did you pick a fruitful research topic.</p>
<p>Also, given that 8% of GRE takers get a perfect score in math, I don’t see how GRE score could possibly be a reliable predictor of success in technical graduate programs – almost everybody who even applies to science and engineering grad programs has a great math score. The range of variation in math is very small, and verbal scores are rarely a factor unless they’re really bad.</p>