Communication Studies isn't a very common A Level amongst most further education institutions. It has now been succeeded by a new subject Communication and Culture, which has just started at AS Level and will have it's first A2 year starting this September. If you are a Year 13 student you will be doing the old Communication Studies syllabus, details of which you will find below. Its is a bit of a strange subject to explain to people, as it involves aspects of other subjects, such as English Language, Sociology, Politics, Psychology and History.
The course is for people who enjoy and are engaged by the world about them - the social practices and culture of young people, the media etc. If you are going to be a journalist or interested in a job in any of the cultural industries it's a must. It is a very interesting subject, although it isn't a traditional one, and so won't stand you in brilliant stead for certain redbrick universities such as Oxford, Cambridge or Durham or if you are planning to apply for a popular or very academic subject.
To find out more about the legacy A Level Communication Studies course, http://www.communicationandculture.co.uk/CommStudies/Templates/A2%20Comms%20index.htm]
To find out more about the new AS Level Communication and Culture course, http://www.communicationandculture.co.uk/index.htm