Hi Aman,

As per the latest eligibility criteria:-

The candidate should have passed all the subjects of class 12th for which he/she is appearing and if he/she is unable to secure 75% then also he/she will be eligible for JEE-Advance 2021 and for admission to IITs.

Refer here for more info - https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!