Class 12-Commerce

Go for what interests you. If you wanna go into IT sector, take up BCA. If you're interested in banking sector, take up BCom. Decide well !!

Well, any of the two will be good. You'll have to complete MBA to get what you wnat.

Which field interests you? Banking sector or management sector?
If banking, go for BCom and then you can do MCom or LLB or CA or CMA or CFA.
If management, take up BBA and then do MBA from a good college and get highly paid.
BBA can take you to MBA only whereas BCom has lots of options as you see above.
1 more thing: After doing BBA or BCom, you become eligible for sitting in compititive exams like IBPS, UPSC, SBI-PO, SBI-Clerk and other bank and railway exams to get a job.

If you love banking, then go for BCom. You'll gain knowledge there. After that, you can give exams like IBPS, SBI-PO, SBI-Clerk. After BCom, you can do MCom. All the best !!

No, it's not necessary to have mathematics.

yes you are . as only iim Indore is the one which conducts Integrated Program in management (IPM) which is after 12th and is of 5 years . you have to give IPMAT test , if you qualify then you will be called for personal interview . then finally the merit list is announced . remember there are only 120 seats for IPM and evey year around 18000-20000 give written exam and around 1200-1300 gets qualified for PI .

After 12 you can do CA, CS,b.com,BBA,B.sc.But for maximum salary CA is the best option and CS also.

You can go for BMS as well!

clearing cs in one attempt is not interlinked with your 12th %. to clear cs in one attempt is solely depends on your abilities knowledge and skills. you have to do productive study with hardwork.
productive study means read 2-3 hours with full concentration then you are fine for a day like this go on.
all the best
please feel free to revert.