Check your race and ethnicity just as you would on the US census. List your languages just as you would if you applying for a job. Each medical school decides, based on the demographics of the population it serves with patient care, who is URM. If a school wants to count you, then it will.
The proportion of black applicants who get admitted is about equall or slightly less than the proportion of white applicants who get admitted. Ditto Hispanic and Asian applicants. For a given combination of GPA and MCAT, the more rare applicants (black & hispanic) have a better chance of being chosen than Asian or white applicants with the same numbers. The thing is, don't look at the percentages, look at the numbers. The number of URM applicants at a given GPA/MCAT are sometimes very, very small and they are highly valued in a med school class because of the diversity they lend to the student body.
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