Dear aspirant,

As you have mentioned that you have secured 85 percentile in JEE mains 2021 and you want to give jee advanced and so even if you don't qualify for jee advanced then you are absolutely eligible for nits and you can join through josaa counselling.

But let me tell you that in this percentile your all india rank would be around 1.5L . In this rank you can hope for lower nits like Srinagar, Agartala, Arunachal Pradesh, Nagaland.

For more information you can check out the link given below-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer