Accounting & Commerce

Certificate in Computerized Accounting / Tally , Certified Financial Analyst, Certified Financial Professional etc. are some add on courses

Certification of CISCO is a valid qualification in networking industry. There are basic level courses such as CCNA,CCNP, CCIE etc. CCNA is only entry level course in networking, CCNP is advanced course. These courses will cover basics of networking and data communication, modes of communications, communication medium, networking devices such as modem, routers, multilexers , router configuration, LAN Settings etc. and many more topics .
Please find a popular network academy in your location and have a detailed discussion with counselor.
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MBA / M Com are the best choices after B Com. There are fellowships like Company Secretaryship-CS , Chartered Accountancy - CA, ICWA etc.which helps you touch the top most positions in IT Industry

A valid score in IBPS, help you to get placed in India's leading banking institutions with high salary. There are two type of examinations, Clerical and PO. Better take PO. After clearing IBPS, you will get offer letter from banks to join as Probationary Officer. There will be 1- 2Years probation, after that you will be placed as Officer / Asst.Manager.
You can do bank preparation along with MBA. And if you are interested in banking, better take finance as your specialization at MBA.
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This is possible through Concurrent admission system. You can do two courses simultaneously , one at regular college and another at Distance / Colloaorative mode. Better do BCA as regular , as it is higly practical oriented course.
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Yes, you can join for graduation in Economics. Alternatively you can also enroll for BCA / B.Sc CS if you are interested in computers.

Sure, he can. 12th standard is the basic eligibility for many government jobs, for example Cashier / Clerical positions with various government department, Assistant of State Bank and Associates Banks , Soldier - General of Indian Army etc.He need to clear various PSc /UPSC, bank tests to get these jobs.
He can go for MBA at any time after pursuing graduation any stream