There are really two types of interviews in college admissions. The "evaluative" interview in which what you say can and will be used during the admissions process. And the "informational" interview, which is your non-threatening chance to learn more about the school from someone who's an expert (like an admissions officer, a student, or an alum). The admissions sections of colleges' websites usually tell you if interviews are offered and, if so, what kind they are.
So, is it in your best admissions interest to schedule informational interviews?
A lot of students (and just as often, their parents) are quick to
schedule an informational interview, especially when they're planning to visit
the college's campus. It's hard not to think that making a good impression could still help in some small way. And the idea of making a personal connection is pretty alluring in the college admissions process.
Still, I think a student should only do an informational interview if you:
1) Are sincerely interested learning more about the school, and…
2) Have questions you would like to get answered.
A lot of the informational interviews are very awkward for the interviewer. Some students don't have any questions because it was actually their parents' idea to visit the school in the first place. Or the student is already completely sold on the school and doesn't have any questions he needs answered. So the interviewer has to sit there and try to fill the time. It's like going on a date with someone and finding you have nothing to talk about.
Think of informational interviews like a first meeting with a tutor. A tutor can lecture you if you want her to, but it's much more effective to make the meeting collaborative. Tell the interviewer what you know already about the school. Then use the time to get a better mastery of this subject (the college). What could you use help understanding? What have you not been able to learn from the website, your counselor or the college guidebooks? Be engaged and interested.
If you're not feeling engaged or interested, save both parties the time and don't schedule the interview. And never do an interview just because you think you should.