I am firmly in the camp that suggests a little practice. Our S16 had several interviews and there were a few things (I think) helped him the most.
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We advised him to assume he would be a little nervous. That’s OK. Channel that nervousness into focus.
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We helped him craft a simple answer to the “tell me about yourself” question (which BTW was almost universally the first question).
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We made sure he had a few school-specific questions for each interview.