Dear Anubhab 

I am giving this answer assuming you are asking about BSc Tea and Husbandry course. Following are some colleges you can seek as they are some of the offering institutes for this course: 

• Assam Agricultural University
• Assam Darjeeling Tea Research Center
• Assam University
• Birla Institute of Futuristic Studies
• Dipras Institute of Professional Studies
• Indian Institute of Plantation Management
• NITM, Darjeeling Tea Research And Management Association
• The Tea Tasters Academy
• University of North Bengal
• UPASI Tea Research Institute

Hope it will help. 
All the best!