At the end of the day, the interview is about seeing if you are someone that others can lead, follow, work with, or work for. You wouldn't be in the interview if you weren't academically qualified. They are making sure the person matches the resume and getting a general feel. They are not there to trip you up. That goes for all interviews, really, regardless of if it's a job, scholarship, or nomination interview. There are no perfect answers. Be professional, be yourself, be confident, yet humble. If you don't get a nomination, remember the quality of the competition you're up against. These really are the best of the best of the best kids vying for very few slots.