Hello Ujwal

As per JEE Advanced eligibility criteria, aspiring candidates need to either secure at least 75% aggregate marks (for Gen Category) in the class XII (or equivalent)and 65% aggregate marks (for SC, ST and PwD candidates) or they should be in category-wise top 20-percentile in their respective class XII (or equivalent) board examination. To calculate top 20 percentile please visit https://engineering.careers360.com/articles/top-20-percentile-cutoff-of-class-12-boards-for-iit-admission