Hi Renuka,

GMAT is the most accepted entrance exam abroad like CAT in India. However, few foreign B schools do accept the CAT score also as valid. These colleges also have foreign exchange programmes with some of the premier IIMs. Some of these (non-exhaustive, not in any specific order) are:

• HEC Paris
• EM Lyon
• Audencia
• ESCP Europe
• SKEMA
• EDHEC
• Norwegian School of Economics (NHH)
• Singapore Managemnt University
• Stuart School of Management
• Asian Institute of Management.
• ESSEC Business School

If you have some specific univeristy in mind you can search for the eligibility criteria for the same.

Dear Renuka, Emylon Business School, Audencia Business School, HES Paris, SKEMA Business School, EDHEC Business School, ESSEC Business School, ESCP Europe Business School, Singapore Management University, SP Jain School of Global Management, Stuart School of Business Illinois, Norwegian School of Economics, Asian Institute of Management are few schools which accept CAT scores. 

If you are expiring for a management course in abroad then GMAT is the most valid and accepted score in most of the foreign universities therefore for any university if you have valid GMAT score then there are required chances that based on your score you will be offered admission it is regarded and considered in India.