hi!
it really depends on the exam board. i've done both of mine via WJEC and they are quite similar in terminology and that.
Mine was AS Media: 50% split between coursework and exam. i think this can be changed, but my coursework was to design and create my own magazine. You basically do the front cover, and a double-page feature for the inside spread. It was really fun. I dont remember too much from my exam but its an essay based on unseen material that you're given, and another essay where you use your own examples (i think!)
AS Film Studies: Another 50% split. Coursework can be changed, but its a written analysis of a film sequence of your choice, looking at Mise-En-Scene, Cinematography, Sound, Performance and Editing (all of which you study first of course) and a Production project. This can be picked by your teacher, but mine was a digital storyboard (again, lots of fun!) It basically means you come up with a film concept, or film sequence, then you storyboard it, taking photos instead of drawing the pics. The exam is 3 essays, mine was on unseen material(like the media one), British Horror films (you study between 2 and 6 in lesson first), and an American Film Comparison (we did Twilight and The Lost Boys)
Basically, both these courses were tons of fun, and theyre relatively easy to pass. Having almost completed A2 media too, i prefer that one (we got to amke an advert/music video for our coursework!) but i hope this helps you choose!
p.s. sorry for the essay! xD