The GMAT exam score is widely accepted across all top B Schools of the world:

The Graduate Management Admission Test is a computer adaptive test intended to assess certain analytical, writing, quantitative, verbal, and reading skills in written English for use in admission to a graduate management program, such as an MBA.

GMAT is a registered trademark of the Graduate Management Admission Council. More than 5,900 programs offered by more than 2,100 universities and institutions use the GMAT exam as part of the selection criteria for their programs. Business schools use the test as a criterion for admission into a wide range of graduate management programs, including MBA, Master of Accountancy, and Master of Finance programs. The GMAT exam is administered in standardized test centers in 112 countries around the world