Congratulations on your excellent GMAT score. Your numbers indicate that you have the intellect and focus to thrive in a top tier MBA program. Nothing about your story makes me think there is any reason why you cannot be admitted, but nothing stands out telling me why you should be admitted. All of the reasons why a top program would admit you are in the details of your work experience, personal experiences, personality, values and overall story.
About your questions, it is not unrealistic to want to change both industries and job function. Most business schools like to see at least 2 years of work experience, although some programs (including HBS and Stanford), are known to look at candidates with less experience.
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Stacy Blackman | Stacy Blackman Consulting Inc | http://www.StacyBlackman.com | +1 323.934.3936
MBA blogger, US News and Author, The MBA Application Roadmap