Every school has different requirements. You can go to the school where you want to take the exam and post it to find out. Some schools can be exempted from taking the exam after passing CET-6, but they don't have to take the exam, but they have to take it. If you pass 70, you can take the exam without taking the exam. After passing 70 in English for postgraduate entrance examination, some schools will train you to a higher level. Like going abroad or something.