As you want to do MBA from abroad so you want the list of top 25 colleges so here is the list:

List of colleges:
University of North Carolina-Chapel Hill (Kenan-Flagler)Chapel Hill, NC
Northwestern University (Kellogg) Evanston, IL
Georgetown University (McDonough) Washington, DC
Massachusetts Institute of Technology (Sloan) Cambridge, MA
University of California-Berkeley (Haas) Berkeley, CA
Dartmouth College (Tuck) Hanover, NH
New York University (Stern) New York, NY
University of Southern California (Marshall) Los Angeles, CA
Yale University New Haven, CT
University of Michigan-Ann Arbor (Ross) Ann Arbor, MI
University of Texas-Austin (McCombs) Austin, TX
Washington University in St. Louis (Olin) St. Louis, MO
University of Virginia (Darden) Charlottesville, VA
Columbia University New York, NY
Harvard University Boston, MA
Carnegie Mellon University (Tepper) Pittsburgh, PA
Emory University (Goizueta) Atlanta, GA
University of California-Los Angeles (Anderson) Los Angeles, CA
University of Pennsylvania (Wharton) Philadelphia, PA
Cornell University (Johnson) Ithaca, NY
Indiana University-Bloomington (Kelley) Bloomington, IN
Duke University (Fuqua) Durham, NC
University of Minnesota-Twin Cities (Carlson) Minneapolis, MN
Stanford University Stanford, CA
University of Chicago (Booth) Chicago, IL