Yes BA In Eco is a good option if you want to shift your interest from science to commerce.
After graduation in Economics you have a good scope.
In the government sector, one may try for Indian Economic Services, jobs in Reserve Bank of India, PSUs and other public sector banks. All these jobs have wonderful career options. These jobs give you social prestige along with financial stability. Private sector also offers jobs for economic graduates in the fields like private banks, MNCs, BPOs, KPOs, Business journals, and newspapers. A good opportunity is also waiting for economic students in higher education. One can pursue Ph.D. in economics to enter into the field of teaching in colleges and universities.

You can apply in University of Delhi for the same. There are many other universities providing the same course. There is an entrance for this course in DU.

Let me know if you have any other doubt.

Good luck.