Thanu, to be eligible for NEET, you should have completed your 12th or equivalent, passed in all subjects and secure a minimum aggregate of 50% in Physics, Chemistry and Biology. This is ideally 10+2 format or equivalent. But if you can study these subjects from NIOS or as a Private Candidate you are eligible for NEET. It is 50% for General Category, 45% for PWD and 40% for OBC,SC,ST. Now if you belong to OBC Category, the Category you belong to should be also listed in the Central OBC list. Or else you will be considered as General Category and so you have to secure a minimum aggregate of 50% in Physics, Chemistry and Biology. This 50% is inclusive of the Theory and Practical marks scored in Physics, Chemistry and Biology collectively. You needn't score 50% in Physics, 50% in Chemistry and 50% in Biology separately. You need an aggregate of 50% or 40% depending on your Category as an aggregate in Physics, Chemistry and Biology. And along with Physics, Chemistry and Biology, you should also have studied English as one of the core subjects in your 12th. But we would suggest you to reach out to the helpdesk at: neet@nta.ac.in  for clarification.