Thank you for posting.
You have an impressive background that some schools, even without work experience, will find compelling.
If you want to shoot for a premier American program at this stage of your development, you should focus on those schools that do admit students directly from college -- including Wharton, Columbia, Kellogg, Johnson, Anderson and Tuck. However, if you do decide to apply to these schools, you have to make sure that your application is compelling -- showing maturity, focus, motivation, etc. They also have to be as high quality as those submitted by candidates who are many years older than you.
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