Commerce

As you are going to be a commerce graduate from Delhi University you can pursue following courses along with B.Com:
(a) ADCA in finance and accounts from recognised institutes.
(b) SAP in finance modules.
Either of these courses from recognised institutes will help you to get a job in different financial companies, retails and KPOs. Follow https://shiksha.com/courses/finance to know more details.

Hi,
According to my opinion, mathematics subject is not compulsory for getting job in banks. You can give bank exam and if you are through it then you can get job in bank.

Hi,
IF you had mathematics in 12th then you are eligible for BCA.

Yes, it can cause a problem. To know about accountancy or to make your career in the same, you must opt for:
(a) HSC in science with maths (b) I.Com or you must be a graduate in (a) Science with maths (b) commerce (c) engineering in any of the streams. If possible try to pursue B.Ed, if you want to make your career in teaching, you may prepare for Banks P.O, SSC, UPSC, etc.

Hi, USA is the top destination. But destinations like Japan, Korea, Singapore which are regional financial hubs are also popular options for business and finance related studies.

Nope, not at all.

No industry can survive without e-commerce. In fact all brick and motor companies are also introducing e-commerce to retain Competitive Advantage. Logistics (SCM) is most major component of e-commerce value chain. SCM specialist requirements and opportunities will continue to grow for next few years.

CISCO does not specify any educational qualifications for appearing for CCNA. There are age criteria for appearing for CCNA. You can appear and get CCNA certification. Indian companies prefer network engineers with graduation degree in engineering or BCA/ MCA, etc. Therefore, I will advice you to gain at least graduation degree, beside CCNA for a good career.