Hello Naveen

International English Language Testing System (IELTS) is conducted to evaluate a candidate's proficiency level in the English language and GRE is accepted for admission to various disciplines at many graduate and business schools across the globe. It covers three major sections- Analytical Writing, Verbal Reasoning and Quantitative Reasoning.

You need to clear IELTS or GRE or both the exams will depend on the institute where you wish to take admission as the admission procedure varies from institute to institute. You will need to check the admission criteria of the college/University and the course which you want to pursue.

Good Luck!