Obc NCL certificate regarding

I am an retired employee from local organisation it Karnataka oil federation I retired on May 2021.i am not having pension policy as per government I am getting pension from provident fund office is fixed ammount Rs 3411/per month .After that as per supreme court order I was eligible for higher pension as per procedure I got higher pension of Rs 15745/ per month.Now my question is that my daughter is studying at 12th class to get higher education in central government institutions I want to get obc NCL certificate since we are veerashyva lingayat I cast , in central obc NCL list this cast is not there.but I red in Google portal that to get obc NCL certificate cast is not a criteria income is mandatory for service people .Now i retired employee I am getting rs.15745/ per month from may 2021 to till date from my three year income is below 8 lack .I got my certificate from local thahsildar cast and income certificate for which eligible for Karnataka state but get eligible for central government institutions how to get obc NCL certificate pl advice regards TM Shivalingaiah cell no [deleted]