How GRE Computer Based Test Works?

The GRE Computer Based Test(CBT) is also some times called as Computer Adaptive Test (CAT). GRE CBT works on 50 Percentile principle. It means that when first question appears in exam is a medium level question. If you answer the question correctly then the next question appeared is a hard level question. If you answer this question also then the harder question is appeared. But if you answered wrong , it would give you medium level question. In the first 5 to 6 questions , the computer understands the IQ of the examinee and then it keeps giving that level question. It is also said that as you going on appear harder questions, the score may be more.