If any SC candidate in will get 80 marks in IIT then he chance delhi IIT trough sc rank at IT or SOFTWARE or CSE BRANCH?
IITs takes the admission through JEE Advance Entrance Exam. It is difficult to predict marks as Exam pattern and Marks change every year of JEE Advance. I would suggest you to go through with the given below link & check the previous year cutoff rank to take an Idea about the admission.
https://engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-delhi
Good Luck!