The interview process really varies from school to school. For example, Harvard Business School accepts over 50% of the candidates they interview, which is a higher acceptance rate than other business schools.
It's always a good idea to practice mock interviews with colleagues and peers to get feedback. We also have some free interview advice here:http://www.stacyblackman.com/tag/interviews/
Hope this was of help.
Conrad and the Stacy Blackman
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MBA blogger, US News and Author, The MBA Application Roadmap