Hello,

As you have completed your 12th Board Examination with Subjects including Physics, Chemistry, Maths and not Biology, you have to appear for 12th Re-examination to get included Biology subject in your 12th Board marksheet .

Yes, you can give 12th re-examination from Board other than NIOS. You can give your re-examination from your State board. But, if you have completed your 12th board from CBSE board then compulsorily you have to give re-exam from NIOS only .

And yes, it is necessary for you to give re-exam for including Biology subject, if you want to appear for NEET. Also, you need to score at least aggregate 60 percentage in PCBE . Otherwise, you won't be applicable for NEET.

Here are the details of NIOS :-

https://school.careers360.com/exams/nios-class-12/amp

Hope this helps. All the Best.

Thank You.