Hii Shree,

The cut off for each year varies depending on some factors.

The cutoff of IITs for B.Tech Computer Science and Engineering act as a selection process for the admission. There are various factors affecting the JEE advanced cut off.

1. Total number of seats available in institutes.
2. Previous year’s IIT B.Tech CSE cutoff trends
3. Difficulty level of JEE Advanced 2021 .
4. Total number of aspirants.

For admission in IITs you need to qualify JEE advanced with valid score:

The IITs are:( only with obc ranks ) for Cse branch;

1. IIT Bombay:  44(neutral) 338(female)
2. IIT Delhi : 83(N) 438(F)
3. IIT Kanpur: 152(N) 677(F)
4. IIT Kharagpur: 14(N) 565(F)
5. IIT Madras: 92(N) 402(F)
6. IIT Roorkee: 205(N) 950(F)
7. IIT BHU: 380(N) 1532(F)
8. IIT Gandhinagar: 767(N) 1392(F)
9. IIT Hyderabad: 228(N) 1091(F)
10. IIT Dhanbad: 998(N) 2701(F)
11. IIT Patna: 1108(N) 3037(F)
12. IIT Ropar: 1004(N) 3023(F)
13. IIT Guwahati: 302(N) 1387(F)
14. IIT Tirupathi: 1663(N) 3197(F)
15. IIT Bhubaneshwar: 848(N) 2255(F)

These are top 15 IITs.

For further details refer to the link below:

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/iits-cutoff-for-b-tech-computer-science-and-engineering/amp&ved=2ahUKEwiuvdSCuNTzAhVHX30KHebzAk8QFnoECAUQAQ&usg=AOvVaw19Ag4gHxNdlVCjKBViIa-f&ampcf=1

Hopefully this will help you.

Best wishes for future endeavours.