No it's only applicable for jee advance, for jee mains--

NITs/ IIITs/ GFTIs Admission: Candidates should have obtained a minimum of 75% marks in class 12 or equivalent exam or they must be in the top 20 percentile in their class 12 examination. For SC/ ST, the eligibility is to obtain a minimum of 65% marks in class 12 or equivalent.

JEE Main 2020 B.Arch/B.Planning Admission: Candidates should have passed 10+2 or equivalent exam from a recognized board with a minimum 50% aggregate marks.

For more details get on the provided link---

https://engineering.careers360.com/articles/jee-main-eligibility-criteria

Hello candidate,
For getting admission into IITs or nits you should score more than or equal to 75% in your respective boards or you should be in top 20 of your respective boards that is the eligibility criteria for jee advance but there is not any condition or criteria for jee mains you can get admission into any of your state colleges by your jee mains percentile.
Hope that helps thank-you.

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