Hi there !!!

Yes you can give NIOS exam for Biology and use P+C+B marks to be eligible for NEET . In NEET NIOS marks are accepted it has already been confirmed again by NTA. Just make sure your aggregate of PCB in 10+2 will be

• 50% for General
• 45% for PWD
• 40% for OBC,SC, ST

And you do have minimum age of 17 years at the end of year (for eg. this year's NEET eligibility you should be of 17 years on or before 31st December 2020)

You can check here all the details of eligibility for NEET here :

https://medicine.careers360.com/articles/neet-eligibility-criteria

Hope this helps.