hi,

see neet 2021 Information brochure is yet to publish. However based on previous years notifications, to become eligible for neet ug candidates must have completed 12th course from a recognize education board with physics, chemistry and biology , english as a mandatory subject. ccandidates from general category need to secure 50% aggregate score in pcb and sc/st candidates need to secure 40% marks in pcb. marks criteria for  obc candidates is 45%.

so based on previous years data you are not eligible to appear in neet by studying biology only from nios.

so wait for this year notifications, every thing will be clear once the official brochure release.

follow our article at below link to get latest updates about neet ug:

https://medicine.careers360.com/exams/neet