one has a good command on ENGLISH. I got 6.5 band without spending an hour for preparation. If you do know good english (in all forms) then don't worry and just go to the examination and give your best. ITS VERY EASY & have confidence in yourself.
Every sections has ample time to give answers with ease and the staff is very helpful. You will be provided with pencil,eraser,sharpner.
You must have to bring along your QID or PASSPORT copy whatever you have mentioned in your application.
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So just relax ONLY IF you have good command on ENGLISH otherwise you need ENGLISH CLASSES to make your english good but there is no need to get yourself prepared for IELTS.