Hiya, I have that exam tomorrow as well. As long has you know the basics it should been fine after that because you can adapt your answers around the basic knowledge. first thing you need to know is the timings of the exam. Each question you should be looking to spend 20 minutes on this gives you extra time in case you over run which is fine.
Question is usually about culture, this can include subcultures (e.g. punks, bikers etc), this will also include things like cultural practices/ products. Question 2 is all about the communication side, this can include a range of things like NVC (non-verbal communication) which involve haptics, para-language, proxemics and more. This also includes how we talk (idolect, sociolect and dialect). Question 3 is all about preferred reading and looking at a text. This will include codes, index, anchors, icons and others. Question 4 usually includes a text, article or even song lyrics and you have to answer it in terms of a communication and culture student and include a range of things you have learnt.
Another key point would be to learn your keywords, i have attached a file that will have every keyword that has come up that is recommend by the exam board.
Also learn your theorists which is key to include in Questions 1,2 and 4. This are the key ones to look up - Goffman (self presentation and staging etc), Rogers (concentric circle), Cooley (looking glass theory).
I have attached some PowerPoint that may benefit your revision. plus check this slideshow out
http://www.slideshare.net/aquinasmedia/as-revision-2012Hope this helped and good luck with the exam.