Okay haha. Well, I don't really know much about the course, but I'm guessing they're just going to ask you about things relating to your personal statement and obviously why you want to do the course.

You could try this: http://www.studential.com/guide/interviews/interviewtips.asp
I've never been interviewed despite applying to uni twice, but it seems like it has some good advice on there.

I also know someone who went to Goldsmiths to study History of Ideas and got them to offer her BBB even though I think the course asks for AAB. So if you have any worries about meeting their requirements, perhaps talk to them about it and explain why you feel the course is for you, what you feel you would be able to take away from it and why you think Goldsmiths is the right university. Have a really good think about why you want to do that course at that university, look into the course details if you can, perhaps even email someone at the university to ask if they could send you any further details on the course. I've done this before too and find admissions tutors are very helpful in general.