I was going to study Media Studies at AS level last year, but due to my own circumstances I opted out. I have friends who did it at AS and are doing it now in A2. All of the feedback I've gotten from them is that it's an easy to handle subject, if you keep on top of your work. If you get lazy that's really the only way you'll fail. But if you make sure you do everything you need to then it would be okay. In my opinion I wouldn't take it on just due to the fact of extra stress. I know GCSE's are hardly anything compared to A-Levels in terms of stress/work, but just to be safe I'd leave it. If media is something you want to peruse in you don't really need it as a GCSE. Some people try to say GCSE's are important, yeah they are for getting into A-Level, but most employers don't really care about GCSE's. Also most sixthforms/colleges don't require a GCSE in order to study A-Level media. Sorry for the long explanation, but I'd stick to the ones you're already doing, so that way you can focus more on them and get yourself a great grade in the exam :)