Sakshi, yes you can repeat your 12th from any other Board. If appearing for NEET is your aim, you need to take Physics, Chemistry, Biology and English as your core subjects. But if you have studied Physics, Chemistry and Mathermatics, if you have studied Biology as an additional subject in your 12th along with Physics, Chemistry and Mathematics, then you needn't repeat your 11th and 12th again. You will be eligible for NEET because Biology as an additional subject is allowed for NEET. But if you did not have Biology as an additional subject, you may have to repeat your 11th and 12th. And as of now because there is no upper age limit for NEET, you can appear for NEET after you repeat your 12th. And to be eligible for NEET, you should have completed your 12th, passed in all subjects and secure a minimum aggregate of 50% in Physics, Chemistry and Biology. 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.