greetings rohit,

all the colleges that offer ba programme course will ask you to choose the disipline that you want to specialise in.

the discipline can be geography, maths, stats, history, psycology etc.

you have to choose for your discipline.

http://gargi.du.ac.in/uploads/images/Update/B.A.(Program).pdf

so any college that you will take admission in for ba programme will offer you the discipline that you want to specialise in.

following are the syllabus for geography and maths:

http://www.du.ac.in/du/uploads/old-ug-courses/BA-prog/1472011_BA_ProgGeography_D.pdf

http://www.du.ac.in/du/uploads/Syllabus_2015/B.A.%20Prog.%20Mathematics.pdf

hope this helps.

good luck.