Work on past papers, as it is all unseen for the exam it's harder than literature to revise as there really is nothing to go over or 'learn' as such, it's just a case of applying skills. Work on answering exam questions in the given time space as sometimes it's alot to write in two hours and people can struggle with time management which can ultimately affect their grade as one of the points on the mark scheme is to have all points well developed and EQUALLY developed across the board. Speaking of which, check the mark schemes and examiners report of previous years to get an idea of what the examiner does/doesn't want. Hope this helps