Hello,

To get admission into any of IITs, you will have to appear for JEE ADVANCED. To predict the proper rank is not possible as, Cutoffs fluctuates every single year. And Cutoffs are different for every branch. Cutoffs are Depends of various factors like-

1. Previous year Cutoffs trend

2. Number of seats in the courses offered by the Institutions

3. Number of Candidates appeared for the exam

4. Difficulty level of the question paper

As you're an OBC- NCL Candidate, You will have to score 9 as Minimum percentage of Marks in each Subjects, and you will have to score minimum 22.5 as Minmum percentage of Aggregate marks. This is the minimum percentage of Marks required for inclusion in JEE ADVANCED 2021 rank list

Please go through this link to see the minimum percentage as catehory and, previous year Cutoffs of IIT Patna (use this Cutoff for reference And predict your rank) as per branch and Category-

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-advanced-cutoff-for-iit-patna/amp

Good Luck.