Dear Aspirant,

It Depends which IIT you are opting for.

Here is a detailed cutoffs(closing ranks) for all CSE branches in all IITs in the past few years:

https://engineering.careers360.com/articles/iits-cutoff-for-b-tech-computer-science-and-engineering

For last year (2020) It ranges from JEE ADVANCED rank 1 - 2251 for general category .

You can also check all the previous year cutoffs(closing ranks) of all IITs on official website of JOSAA -

https://josaa.nic.in/Result/Result/currentorcr.aspx

Also check -

https://engineering.careers360.com/articles/jee-advanced-cutoff

Check this, might help:

https://engineering.careers360.com/articles/how-crack-jee-advanced-2021