Hello,
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• B.com in finance
• B.com in accountancy
• B.com in generals

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These 3 courses are good enough to prepare for CA/CS. As all the 3 courses are dealing with accountancy, you will get a perfect base for preparation.
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BCOM generals Will have basic syllabus and maybe you find tough syllabus while getting prepared for CA. Accountancy/ finance will be a great option to choose as they have deeper syllabus which helps you to understand all the important topics for CA preparation