Dear Student,
One of the most sought after courses in India is B.Com. If you want admission to the top colleges in Chennai like Loyala or MCC then you need to above 90% in your grades to be even considered. This is the level of competition. Since we have no indication of your marks, we will not be able to suggest.
In India Cost and Management Accounting is taken by The Institute of Cost Accountants of India – a statutory body. To become a Cost Accountant there are two routes and they are shown in this link: https://icmai.in/upload/Students/AboutUs/CMA-Route.pdf
After your 10+2 you can take a foundation class and proceed or finish your degree and write your intermediate exam after that. If you want to write this exam while learning for your degree then you need to write the foundation examination and proceed. Please visit their site and read very carefully.
Good Luck
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