By the looks of it your English is pretty fluent and devoid of errors. Securing 6.5-7 should not be a problem.
One tip that no one likes to share with you is to have a very good night sleep and a hearty breakfast. Take your mind off and chill out.
Listening: do not look around for a second. listen carefully. write ur answers quickly on ur question sheet. Section 3 and section 4 are going to be pretty fast in terms of speed but still manageable. So you had better try to get max mileage out of first two sections.
Reading: do not spent so much time on answering one question move on. You can start from any passage in order. There must be one that is very hardest and trickest passage so it will eat up most of your time. Just have a quick look at the pssages from which you should start answering questions.
writing: Again, practice. learn some specialized vocab that might come handy in writing task1.
speaking: show off your vocabulary, connectors, and speak clearly. No need to mumble jumble your sentences in order to sound like a fluent speaker.
Good luck
