Hi Sarabjeet,

Integrated B.Tech and M.Tech is a dual degree of 5 years. The best colleges in India for integrated course of B.Tech and M.Tech are listed below

• Indian Institute Of Technology, Delhi
• Indian Institute Of Technology, Madras
• Indian Institute Of Technology, Kharagpur
• Indian Institute Of Technology, Kanpur
• Indian Institute Of Technology, Bombay

You can check more about the colleges at the Undergiven link :

https://engineering.careers360.com/colleges/list-of-dual-degree-engineering-colleges-in-india

Hope it helps :)