Will it be good for me to choose economics instead of PCM in 12th as I want to prepare for UPSC and crack IAS?

Yes, Tamil Nadu Dr. J. Jayalalithaa Fisheries University (TNJFU) accepts 12th Computer Science/Maths students for the B.Voc in Industrial Aquaculture program.

Yes. Aadhaar is needed for registration, for face authentication on NSP, and for payment. The bank account must be seeded with Aadhaar for the money to arrive.

Central schemes are filed on scholarships.gov.in after One Time Registration. State schemes are filed on the state portal, though twelve states and union territories route their applications through NSP.

All four central post matric schemes use a family income limit of INR 2.5 Lacs per year. State schemes set their own limits, so check the notification on your state portal.

Yes. Class 11 and Class 12 come under post matric schemes. Both central schemes on NSP and state schemes accept applications from students studying in these classes.