Hello Vivek,

As you have passed your class 12th and you are expecting around 85 percentile in JEE-Main so you can appear for JOSAA counselling for allotment to NITs/IIITs/GFTIs because as per current eligibility criteria the 75% criteria has been waived off and now you only need to pass in class 12th so as you have passed in class 12th so you are definitely eligible for admission

For more details kindly check out the link given below :-

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

Or if you want to appear for session 2 as well then you can appear for it to improve your percentile and then the final result will be made of best of 2 results.

I hope this information helps you.

Good Luck!!