Hii!
Yes, NIOS is a recognised board of education in India and is valid too. So, yes, if you satisfy the eligibility criteria for NEET UG entrance exam, you can apply for it even After passing from NIOS.
The eligibility criteria for NEET UG entrance exam states that the candidate must have passed class 12th with minimum 50% marks in PCB and English language as compulsory subjects as an aggregate from a recognised board of education.
Hope this helps.
Good luck!

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