B.Com

if you want bright future you will do CA, CS, CMA OR BBA MBA with good colleges

If you are keen on doing MBA, you should take up BBA course after 12th. But know this, BBA is a one way course; you'll be left with only one option after BBA, that is MBA. But if you do BCom, you have other options as well the option to do MBA.
1 more thing: Whether you do BBA or BCom, after 3yrs you become eligible for compititive exams like IBPS, UPSC, SBI-PO, SBI-Clerk and other bank and railway exams. All the best !!

if you are good in study you can do professional courses or CA, CS, CMA, MBA etc.

You can do BCom from Xaviers. But if you are keen on doing MBA afterwards, take up BBA course. It will help you with your MBA target. But know this, BBA is a one way course. You can do only MBA after BBA. But if you do BCom, you can go for MBA, MCom, CA, LLB, etc.

In order to get enrolled in CA Course after B.Com, only your 3rd year marks will be considered. You have to get minimum 50% marks in 3rd year. Yet I would suggest you to give CPT, it will save your time as CA is a lengthy course.

They don't serve B.Com. They only provide BBA for students with minimum 60% in class 12th.

Do MBA, if you want to. Otherwise, go for MCom, or LLB. Or just give exams like UPSC, IBPS, SBI-PO, SBI-Clerk to get a job.