Hi Shushant Kunar Gupta,

You can take admission in BTech CS branch via two means. One through entrance test IIT JEE and IIT advance and directly take admission after class 12th. In first option you have to take test and get your counselling done. For second there are many good private colleges like-:

1. BIMTECH
2. VIT
3. SRM Institute of science and technology
4. BITS pilani

Hope this helps you.