Dear Vishal,
if you get improved marks with new marks-sheet with 75% or more at the time of councelling , then olny you will be eligible for IITs ,NITs and BITSATs.
if you are SC or ST then you will need only 65% to be elegible.
for more information please visit the website given below-
https://engineering.careers360.com/articles/bitsat-eligibility-criteria
https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria
https://engineering.careers360.com/articles/jee-main-eligibility-criteria
hope you understand
thank you
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