Dear aspirant,

More than 45% of score is sufficient to get a seat in good branch in an old IIT for an SC category students.

Now you will get minimum crl for getting iit is 54 marks for SC category students. Each subject you get 5% of marks is minimum and 17% of aggregate marks for qualification only.

If you get good rank or IIT you have to score more marks. You will must have to score at least 30–40% marks. Then you will get definitely IIT.

Hope this is helpful to you,

Thank you.