Humanities & Social Sciences

It is a very good option because you get diversified career options as compared to B.Sc or M.Sc.

All specialization are equally good and offer equal career prospects as Economist or Statistics in different banks/apex bank and financial firms. Anyone can have jobs like:(a)Specialized officers in different banks/apex bank
(b) IRS (UPSC)
(c) SSC (the) different financial companies or firms.
Accordingly, you can opt either of any courses as
(a) MA in Economics.
(b) M.Com in Economics/Statistics.

No, it is not.
Post-graduation Diploma courses are typically for a shorter duration than a full time degree, and they also cost less than a Master's degree. In addition, one can assume, that a PG is for the introduction into a new field of discipline, while a Masters is considered an advanced stage to the initial studies carried from previous knowledge. It is like, Post graduation Diploma can be used as a building block towards the Master's degree.

Which course is better either MA/MBA or M.Com depends on institutes and its programmes. Both are equaly good and offers equal career prospects. If you are interested to pursue finance and accounts, you can opt either of any courses as (a) MBA finance (b) M.Com. For more details and procedures, kindly visit https://shiksha.com/courses/MBAFinance or M.Com.

Yes, you can. The procedural affair has to be consulted with the bank before proceeding.

You can check their official website:
http://www.caluniv.ac.in/admission/ba_llb_15_16_new.pdf

Maths is not compulsory in BA graduation degree at Delhi University.

The candidate should complete their 10+2 or its equivalent exam in Science stream with Geography as one of the subjects.
The marks of admission for this course may vary from college to college and at many places entrance exams and interviews are conducted for admission.

In my opinion BA honours in economics is a better option.
It will include all aspects of economics. It will include mathematical and theoretical aspects of economics. It will include micro, macro, statistics, international economics, econometrics. It will be relevant in every field. It is an academic course. It is a vast course. BA business economics will focus more on the business aspects. It will include topics like consumers behaviour, producers equilibrium, demand and supply. It is a professional course. It is a specialised course.