Hi Sandep Kumar. The question you have asked is incomplete. Finish the question properly so that we can help you with it.

Lucent General English, Lucent General Science and General Knowledge are good resources to prepare for NDA examination, going through them thoroughly might give a cutoff clearing score. You must prepare for Mathematics very well, 12th level mathematics is sufficient, scoring good in Maths section will give a boost to your overall score. Also English of 10+2 is enough for NDA written test, main factor is to attempt GAT. You may also check out NDA Pathfinder

Hello! Hope you are doing good

You can end up doing graduation in computer science because then there are certain posts in railways for which this degree is a must. If you like sociology then you can continue with that or even take life sciences in graduation as a subject if you like environmental education. if you like drawing then you can even take painting as a subject and carry on with your work. What career opportunities you have depends on what you would like to do.

All the best

Hello

You can go through the link below and download the Model Question Papers
( Previous Year Question Papers) of Madras university:

https://egovernance.unom.ac.in/qpregular/question_main.asp

Good Luck!