Hi

I am guessing that you want to give NIOS on demand examination of biology and chemistry because you haven't studied them in 12th , if the reason is something else then do let me know about it in the comment section below.

As of now recognised open board students like NIOS and students who have passed Biology as an additional subject are eligible for Neet examination until Supreme Court gives its decision on it.

But same is not the case with chemistry,

If you haven't studied chemistry in your class 12th and you  pass nios chemistry examination additionally after your class 12th then you won't be eligible for Neet examination.

This is because,

To be eligible for Neet it is mandatory to pass chemistry as a core subject.

For reference,

Here's the eligibility criteria for NEET :-

-----------) Qualification required :-As per Neet eligibility to be eligible you must be either appearing for 12th board examination  or should have passed 12th board examination with physics, chemistry ,biology/biotechnology and English as core subject.

†††Important Note :- Students who have passed Biology as an additional subject are also provisionally eligible for neet until Supreme Court gives its judgement.

-----------)  Percentage required :- You must get

• at least 50 % in aggregate of PCB i.e Physics, Chemistry and Biology/Biotechnology in 12th examination if belongs to general category

• at least 40% in aggregate of PCB if belongs to st/Obc/ Sc

• at least 45 % in aggregate of PCB in case of pwd candidates to be eligible.

----------)  Age limit :-

• Lower age limit:- to be eligible for neet  one has to be at least 17 years old or more by 31st December in the year of appearing for the examination .

• Upper age limit :-The upper age limit  is 25 years as on the date of neet examination and there's relaxation of 5 years for obc ncl/SC/ST /PwBD students means upper age limit is 30 years for these categories.

†††† But since 2018, the case of upper age limit is pending in supreme court , and so there's no upper age limit as of now until supreme court gives its judgement over it.

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

Thank you