Dranb.com is a GRE Preparation website started by UC Berkeley and Stanford graduate students in 2010; the website aims to help students prepare for GRE exam and provides stduents with GRE practice tests , which is required by most graduate schools. Dranb uses scientific algorithm to determine which words are most likely to show up in the real exam, and students who used Dranb.com had a stunning average GRE score of 1520. It’s certainly one of the most effective preparation materials on the market.