Hello,

As per JEE Advanced eligibility criteria, 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.

Top 20 Percentile Cutoff 2018 for CBSE(Central Board of Secondary Education) is as follows-

General- 432
OBC-NCL- 424
SC- 410
ST- 390
PwD- 390

You can refer to the link below to check the detailed information about how to calculate top 20 percentile and also top 20 percentile cutoff for CBSE

 https://engineering.careers360.com/articles/top-20-percentile-cutoff-of-class-12-boards-for-iit-admission

Hope this helps.

Good Luck!

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