I used to follow Liz's method and E2 Jay's method (a combination of both) Somehow I got 7 in my second attempt, but after that, I tried a different approach, 5 paragraph method (intro-Bod para 1,2, 3 or opinion- conclusion) It took some time to get used to that. I think in India, to score 7+ you must give them something different than the common style. And also learn good vocabulary for each topic (For eg, my essay was about the involvement of teenagers in social problems, so I included words like substance abuse and drug peddlers) Also learn some idiomatic phrases (not idioms), learn how to use them in the essays on different topics (eg, key to success, as a means to an end). I don't know which one of the above impressed them, so try to include all of these in your essay. Good luck