Hello Buddy! Hope you're doing good.

If you are appearing for NEET 2021 then you have to show 12th certificate from NIOS'2020. But if you want to appear for the NEET 2022 then you have an option between these two. Make sure you have to score a minimum percentage of 50% in PCB in your 12th boards.

And there's no rule of year gap in NEET prospectus that makes you ineligible for appearing in exam. There's only a criteria that your age should not exceed 25 years if you belongs to unreserved category. Hope this may helps you.

ALL THE BEST! WORK HARD !!