Hello Times, I am not sure in the past. But now they require in most of the universities. Well Im in texas, University of Texas at arlington does not require if gpa>3.0 but it ask for 1 year experience and its expensive also. But,if I want to work as Research assistant, it requires GRE. If I work as RA, I will get tution deduction. Some other universities in texas also require GRE. I found that Barron's book is the best but I really want to hear the experiences in taking GRE. I have very few friends who gave GRE.