Hello Rajan,

Some top college offering B.tech in mechanical engineering:-

• Indian Institute of Technology, Kharagpur
• Jadavpur University-Faculty of Engineering, Kolkata (JUFOE-K), Kolkata 
• National Institute of Technology, Durgapur (NIT-D)
• Gunamay Majumdar Institute of Science & Technology, Kolkata 
• International Institute of Information Technology (IIIT-K)
• Narula Institute of Technology (NIT), Kolkata 
• B.P.Poddar Institute of Management and Technology (BPPIMT), Kolkata

Thank you