Depends on your marks best is MIT

Its great to see you are sure about joining computer science ,but before that you must be really good in computer courses to join as this course requires logics and need to be really good at analysis and coding.

If you are interested in CSE branch you can check below top colleges

Indian Institute of Technology, Delhi

Indian Institute of Technology, Bombay

Indian Institute of Technology, Kharagpur

Indian Institute of Technology, Kanpur

Indian Institute of Technology, Madras

Indian Institute of Technology, Roorkee

Delhi Technological University, Delhi

International Institute of Information Technology,  Hyderabad

Indian Institute of Technology, BHU

National Institute of Technology, Tiruchirappalli

National Institute of Technology, Surathkal

National Institute of Technology, Rourkela

Malviya National Institute of Technology, Jaipur

Private

Manipal Institute of Technology, Manipal

Birla Institute of Technology and Science, Pilani

VIT University, Vellore

Thapar University, Patiala

Good Luck!!