Vishal, if this is regarding NEET 2020, the last date for NEET application form has been closed and even the correction window has been closed. So now, you cannot make any changes to the application form. But to help you with what you have asked, according to the Information Bulletin, 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 if the Community you belong to is also listed in the Central OBC list, you will only need 40% in Physics, Chemistry and Biology.

Hi, in NEET UG application form under category just fill your desired category which is as you mentioned is obc and you have required certificate for that too.
During the time of counselling you need to show the caste certificate as well to get the required quota too.
Hope this helps

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