What is the difference between IELTS/GMAT/TOEFL ? Hello, I purpose to apply for a graduate study within the next two years. I have heard about these tests (IELTS, GMAT, TOEFL) for a long time. But I wonder what is the difference between them? If I have one of them, do I need the other too? Or only one is sufficient. I would be very greateful if someone could explain me. :)