There are typically four types of interview questions for admissions: College Specific; Personality; Activities, Interests, Goals; and Broadly Speaking. Do your homework. If you haven't researched the university or given attention to why you want to go, what experience and education you hope to gain, this should be a priority. Have a few questions of your own to ask (and don't ask about something that you can find the answer to easily by looking at the website - in other words, don't insult their intelligence. ask a question meaningful to you but that you truly can't find the answer to easily).
• Why Stanford?
• How do you think you would contribute? (on campus, in the classroom)
• Describe yourself in three adjectives, and explain your choices.
• What are your strengths and weaknesses?
Activities, Interests, and Goals
• What has been your most interesting activity in high school? Why?
• Tell me about your favorite book.
• Where do you see yourself in 10 years? What are you doing?
Broadly Speaking ….
• If you were given $1000, what would you do with it?
• You have the ability to change anything, what would it be?
• What is your opinion about [current topic/issue]?
In general, it's good to remember to be yourself, make eye contact, and enjoy the conversation!