Hello aspirant

Yes you can reappear for examinations for  pcb subjects from NIOS .

NIOS is National Institute of Open Schooling.  NIOS is government recognized and NIOS marks are accepted in neet .

Make sure you must get 150 marks in physics, chemistry and biology ( including practical marks ) subjects .

You will have to present a Gap certificate during counseling process .

The minimum age for appearing Neet is 17 years . Government has removed upper age limit criteria . Hence the students can have many  attempts to Crack  neet exam .

For details kindly refer the l8nk given below

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