The importance of the interview varies from college to college. For some colleges the interview is just a formality and for others it becomes a determining factor. A 2001 graduate of Shawsheen who interviewed at a university in northern New England was told that his transcript was borderline for admission standards, but his interview was excellent. The happy ending is, he was accepted to his first choice college.
So, the moral to the story is you never know how much the interview will count towards your acceptance so prepare for it like it was the only determining factor.
Practice the interview
There are typical questions that you will most likely be asked.
Practice these with a friend or family member. Come up with answers that you are
comfortable with and can articulate well
Gather Your Documents
If you have already applied to the school, they will most likely have a file
that contains your application and any other documents that you have sent.
If you haven't applied yet, be sure to bring an unofficial copy of your
transcript, any test scores, an updated college resume, and other relevant
papers such as portfolio work.
Get Oriented
Be sure to get a good night's sleep. Yawning during an interview will
not make a good impression. If this will be your first time on
campus, plan to arrive an hour before your interview so you can find parking as
well as the building where your interview will be held.