To know the opening rank and closing rank(cut-off) of BTech civil engineering and computer science engineering, please go through the following link provided below:

https://engineering.careers360.com/articles/iits-cutoff-for-b-tech-civil-engineering

To know the number of seats available in IIT category wise, please go through the following link:

https://www.plancess.com/jee-mag/total-number-of-seats-and-fee-structure-of-iits-this-year/