First of all you need to believe in yourself and aim even higher than 7 bands. It is a language test and you only learn a language properly when you do proper practice and start living in that atmosphere where you speak, read and write in English.
Your surroundings are really important if you manage to convert all your conversation and written documents in English then it is assure that you will get more band then your requirement.
Another which is really important for your IELTS test is your focus, while doing your test you brain must be focus on what you doing rather thinking about random stuff which distract your attention and you end up    getting lower bands.
You need to be an expert of paraphrase.  IELTS is all about paraphrasing no matter what you are going to do reading, writing or listening you will find paraphrase everywhere.
The key is
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