STYLETHREAD -- LET'S TALK SHOP!

yay! congrats on getting an interview.  i'm not sure what type of program you're applying to so i can only offer general advice...

*know your story, in and out. for bschool you have to submit a resume and a lot of times it was a blind interview in that the person didn't read your app. & just had your resume. n/s if it will be the same, but you should really be able to walk the person through your trajectory -- what you've done in the past that leads you to the decision to go to school, what you hope to gain out of the experience of going back to school, how going to school will help you in the future, etc.  again this may vary depending on type of program, but it never hurts to be able to clearly articulate this sort of stuff

*know the school -- again n/s how well this will transfer. but with my grad school stuff, a big component was being able to sell the interviewer on the fact that x school was the only school for you.  obvs this is easier if you've only applied to one program, but regardless make sure you know lots about the school, what makes it unique, why it's the perfect place for you to learn, etc.

*be personable -- ime a lot of interviewing had to do with fit & them interviewer making sure they liked you/wanted to go to school with you. so it can never hurt to be charming & upbeat. which i'm sure you are.