Hello Aspirant

The cutoff for varies over a lot of factor some of them are

1.No of students appeared in the exam

2.How tough was the exam

The cutoff for each college is released on their website

I'm helping you with the cutoff of 2018 an =d they were as follows

open:43.89% closing at 34.17%

obc:47.78% closing at 30.28%

You can refer to the following website for this year's cutoff

https://engineering.careers360.com/articles/iist-btech-cutoff

I hope this helps

Thnaks