Hey aspirant,
Yes , NIOS candidates are eligible for NEET
THE BASIC ELIGIBILITY CRITERIA IS AS FOLLOWING

Candidates must have passed 10+2 or equivalent with Physics, Chemistry, Biology/Biotechnology and English as core subjects from a recognized board. Class 12 or equivalent appearing aspirants are also eligible to apply for NEET


The class 12 percentage required for NEET 2021 exam is separate for each category and can be listed as under. NEET eligibility marks in class 12 to be considered are aggregate marks only for PCB subjects

UR - 50%,

OBC/SC/ST - 40%,

PWD - 45%


Age - 17 years


Here's a link which you can check for any additional doubts or information
https://medicine.careers360.com/articles/neet-2018-what-nios-students-and-private-candidates-should-know

Hope it helps
Thank you

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