As a few of the other posts have said - if you're a native English speaker then the test is pretty straight forward. I was born in the UK, school, university and worked in the UK for 10 years plus and got 8's and 9's in the modules with 8.5 overall. I wouldn't say I revised but I did take a look at the format of each of the modules - how long you get for each one, how many questions there are (especially for the writing test). The listening and reading were fine - you do just have to concentrate and make sure you writing in the correct boxes, the speaking is just a conversation so fine too. For the writing I just made sure I kept an eye on the time and allowed enough to answer both questions allowing more time for the question with the most points associated with it. Remember to take a pencil (some sections no pens allowed!). Good luck!