Hi

Neet 2021 eligibility  criteria says that, to be eligible  you must  should have passed 12th board examination with physics, chemistry ,biology and English  as core subjects and must have got at least  50  % in aggregate of PCB  i.e Physics, Chemistry and Biology in 12th examination  if belongs to general category , or   at least  40%  in aggregate of PCB if belongs to  Obc/ Sc /st category or at least 45 % aggregate in PCB in case of PH candidate.

Also,  students with  Biology as an additional /optional subject in 12th board are provisionally eligible for Neet examination until the supreme court give its judgement over the eligibility of students with Biology as an additional subject.

Now,

Additional/optional subject is nothing but the 6th subject in your 12th board examination. So, if you had studied biology even as an additional /optional subject in your 12th board then you were eligible for NEET.  But, it is unsure that you will be eligible by just passing your Biology later on after 12th from a different board i. e NIOS

For detailed information about neet examination eligibility go through our page for which link is provided below; -

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

So, if you want to be eligible for Neet ,  I would suggest you to give NIOS on demand examination for 12th  with all the  5 subjects including physics ,chemistry biology and English and for the 5th subject you can choose any subject of your choice like Hindi ,Sanskrit, maths or any other subject and after passing,  if you fulfill the aforesaid percentage requirement in PCB  i. e 50 % for general or at least 40 % for obc/sc/st or at least 45 % for ph then you will be eligible for neet and can get admission in MBBS on basis of marks obtained by you in the Neet examination .

Thank you