B.Com

If you score between 95 and 100 percent marks, then you can get admission in DU to pursue B.Com.

In B.Com, the admissions are purely on merit basis, as there are no separate admission tests so you will get admission only according to your score in 12th.

You need to study maths till class 12th if you want to pursue B.Com. Logical thinking also plays a very big role in B.Com.

It depends upon college to college, they may take you or they may not. You can try Indus Business Academy, Bangalore for that.

Yes, you can start preparing for BPSC. Follow the website of BPSC to know more details about selection, papers and procedures/preparation. You can select papers or your subjects on the basis of your interest and inclination.

As a commerce graduate, if you are looking a job then try to pursue following courses.
(a) CAT i.e certificate in account technician from ICMAI or ICAI.
(b) Advance Diploma in computer application in finance and accounts from recognized training institutes.
(c) PGDFM from NISM or NSE.
If you want to continue your study, you may pursue CA or CMA.

You can pursue CA or CMA course.

You should opt for CA along with MBA in finance.

Yes, you can start the preparation. Just devote more time for CAT preparation. Application form of CAT for this year is closed. You can start preparation of other MBA entrance exams like TISS, XAT, CMAT or aim for next year CAT exam.