Hi Krishna,
It depends on the universities you are applying to. If you are going for MS in US , most of the cases you have to give GRE exam and TOEFL for English proficiency. If you are planning to do MS in Europe, the scenario is a bit different. Most of the universities do not ask for GRE exam , only scores of TOEFL or IELTS exams. But recently the percentage of European universities asking for GRE is also steadily increasing. The best German universities TU9 ask for GRE scores as well depending on your field of study.
I hope that answers your question.