never faced such a thing but anyway here is something you can start off with

its focused on US but I assume it should be more or less similar to NZ
http://www.quora.com/What-are-the-questions-asked-in-a-college-interview-on-Skype
How are you? You having a good day so far?
• Why do you want to study in the US(NZ)?
• Describe your high school.
• If there were one thing you could change about your high school, what would it be?
• What does your high school do well?
• Have you grown since you entered high school? How?
• How do you operate as a student? Reference in class and while studying.
• What are your strengths academically?
• Which teachers have you connected with in high school and why?
• What elements make a great teacher for you?
• Tell me about your friends.
• Has your friend group changed since you started high school? Why? How?
• Which of your friends do you most admire and why?
• If you are having a bad day, what types of things do you do to cheer yourself up?
• Who makes up your family tree?
• Describe what sorts of things you do as a family?
• How is your family supporting you through this college search?
• How do you hope college will be different from high school?
• In creating your college list, what are key characteristics you are seeking in an institution?
• Given your expectations, why is X University on your list/of schools?
• University?
• What exactly do you hope to gain from your overall X university experience?
• What can I tell you about X university?
• Do you have other questions?
************************************************************************************************
1. What did you do this summer?
2. What do you do best?
3. What do you hope to do after graduation?
4. Why do you want to go to college?
5. How do you define success?
6. Who do you most admire?
7. What is your biggest weakness?
8. Tell me about your family.
9. What makes you special?
10. What can our college offer you that another college can't?
11. In college, what do you plan to do outside of the classroom?
12. What three adjectives best describe you?
13. What do you think about the latest news headline?
14. Who is your hero?
15. What historical figure do you most admire?
16. What high school experience was most important to you?
17. Who most helped you get to where you are today?
18. Tell me about your community service.
19. If you had a thousand dollars to give away, what would you do with it?
20. What subject in high school did you find the most challenging?
Good Luck

