NT-B falls under OBC in Central list. But in NEET application form, there is OBC-NCL and General Category. So, if your income is less than 6 lakhs per annum, you have to select OBC-NCL and if your income is more than 6 lakhs per annum, you have to select General Category. But during filling the State NEET application form, you can select NT-B Category and you can claim your reservation. You can check the complete application process at our page, https://medicine.careers360.com/articles/neet-application-form.