Just a few (hopefully, helpful) pointers off the top of my head - what kind of agency is the interview with, e.g. one of the big London ones or a smaller, regional agency. The big London agencies will presumably be wanting you to 'scout' for the next Kate Moss and models suitable for catwalk and editorial work (glossy mags etc). Local or smaller agencies may have completely different criteria and perhaps just want pretty faces to do local beauty or catalogue work. Do your homework and see what models/looks are in at the moment and why. I don't think any degree is appropriate for that kind of work, you can't really be taught how to spot that kind of potential in people, so you have as good a chance as anyone. Presumably, studying dance must make you quite 'body conscious' so you could 'sell' your degree as being appropriate from that perspective.