hey ROHIT, since you asked for eligibilty for NEET 2020 so first a fall i want to tell you that NTC  is nomedic tribe caste which falls under scheduled castes and the qualifying marks required in pcb in class 12th for sc candidates is 40% ,hence you are eligible for NEET 2020 being an sc candidate and this 12th % dosen't matter in your selection in goverment colleges, The higher you score ,the higher chances you make for securing seat in goverment colleges.