CA

Government departments generally do not hire directly. You will have to appear in entrance exams to become IT officer.

It all depends on you and your efficiency.

Well done and very good dession
Its like ek thir se do neshne

If CA or any Professional Accounting credential is your career destination its better to opt for commerce in +2.

CA is no doubt a great choice to be a Professional Accountant but the study time is lengthy. I would suggest you to better go for International Professional Accountant courses like CMA (US). Being a BBM, you will be eligible to write the CMA exams. It has 2 papers and great demand in MNCs of India and abroad.

Go for CA, CS doesn't require much efforts to clear, like that of CA. you can do CS side by side of CA course.

you can do CS or CMA along with CA. CA along with LL B is good option. provided it should not clash with your CA articleship timings

Full Form of CA (there are many, but some of them are here, and others can get on Internet)
Computer architecture - Information Technology
Concurrent Audit- Banking
Channel Aggregation- Computer and Networking
Communication Application -Computer and Networking
Conformity Assessment- Computer and Networking
Chartered Accountants - Business Organization

not very tough,just you need to work on basic concepts along with your +2 exams and stay confident.