Is it too late to apply for Cambridge? (Serious help required!)?

What grades did you get at GCSE - all As? What are you predicted for your AS/A levels - all As? If all of this is true, then talk to your college about perhaps adding some more A levels in less "fluffy" subjects than film studies and media studies. But if your grades aren't at the level I've mentioned, then to be honest, do not bother. Instead, move on. Find a uni you like, and go there instead.