It is for AQA Right?
In January i did the exam and it's basically comprehension for the first few questions.
My advice to you is that you know different language techniques, and you know what the effect is. As well as the days leading to your exam, i think you should analyse magazines, leaflets for their GAP and things like that. It helps a lot. I remember doing it, and i got a better grade than i expected.
Good luck for your exam! (: