Hii Omkar,

Here's a list of   top  colleges In India for MBA in Agribusiness:

• IIM Ahmedabad - Indian Institute of Management (IIMA)
• IIM Lucknow - Indian Institute of Management (IIML)
• Parul University
• Suresh Gyan Vihar University - SGVU
• MITCOM - MIT College of Management
• Apex University
• SVVV - Shri Vaishnav Vidyapeeth Vishwavidyalaya
• KIIT School Of Rural Management - KSRM
• Amity University, Jaipur
• GD Goenka University - GDGU
• Garware Institute of Career Education and Development

These are the few of top colleges. 

Now.there  are  different entrance exams ,like 

MAT, XAT, GMAT, CAT, CMAT, ATMA, MAH CET

All the best!