M.A

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.

Hi,
CAT is a national level test whose marks are accepted by all the colleges in India baring few.