Which unit is this again? I remember for one of the A2 there's pre-release case study material you're supposed to have read beforehand, but I might be mixing it up with Unit 3.
To be honest with you, the best thing to do is practise your exam technique and the exam is more about how you think rather than what you know. So that means looking at past papers, practising your comprehension skills and writing essays under timed conditions.