Hi

Yes you are eligible for 85% state quota even if you are from NIOS.

Moreover,

85% state quota largely depends upon whether you are  domicile of that state or not rather than the place  from where you have completed your 10 + 2 and sometimes both is considered. And in some cases like that of Delhi only the place from where you have completed your 10+2 matters

In your case,

Your profile suggests that you are from  UP so

You need to fulfil any one of the following in order to be domicile of UP and thus be eligible for UP state quota :-

• You must be native of UP and your father should be a Resident of the state of UP.

  Recommended

• Your  parent/s should have lived UP for at least  3 years.

• Your parent/s should be working with the Government of India.

• If you have passed your 10th and 12th from the state of UP, then you don't need to furnish domicile certificate and you will be eligible for UP state quota

• If you have have passed either your 10th or 12th UP, then you need to furnish UP residence proof of your parent/s in order to be eligible for UP state quota

So, if you satisy anyone of the above points then you will be eligible for UP state quota

For more about domicile state , check out our page at

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

Thank you