As you have asked about the best colleges for Master of Business Administration (MBA) in International Business, I am mentioning them, check below for the details

INSEAD (Singapore)
Harvard Business School
The Wharton School, University of Pennsylvania
London Business School
IE Business School
Thunderbird School of Global Management
Stanford University
University of Southern California
University of Cambridge
University of Chicago
Columbia Business School, Columbia University
Fox School of Business and Management, Temple University
Northwestern University
IMD
IESE Business School - University of Navarra
SDA Bocconi School of Management
Haas School of Business, University of California Berkeley (UCB)
Melbourne Business School
Sloan School of Management, Massachusetts Institute of Technology
HEC Paris MBA
University of Oxford
Indian Institute of Management (IIM) - Ahmedabad
ESADE Business School
School of Management, Boston University
NYU Stern School of Business, New York University (NYU)
University of St. Gallen
UCLA Anderson School of Management, University of California Los Angeles
The Fuqua School of Business, Duke University
Ivey Business School
National University of Singapore (NUS)
University of Toronto
Ross School of Business, University of Michigan