To qualify for NDA , you must either be appearing or have  passed 12th grade in any board . Since your brother hasn't passed, he has to write NDA only after clearing his physics paper . There is still hope , don't you worry about it at all. Just focus

Dear student,

This is to inform you that this won't create a problem because you have already applied for making the necessary changes therefore even if the card details do not get changed before 11th January you can definitely submit/apply the documents. There were certain instances where the marksheet had

Dear Student,

At first you need to decide that in which field you want to be a Officer and to be a Officer you need to complete at least your graduation degree then only you will be eligible to be a officer in any field. You can choose any course