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For any course the minimum requirement of marks is 50%, if you are looking for any particular college you can apply for it, but if you are looking for B.Com you have to better and improve your Maths.

Candidates who want to pursue company secretary course, they must finish their Class 12 in any disciple except fine arts from a recognised institution.

After that, you are eligible to apply and get registered for first level of the CS Foundation programme. There is only general Maths not the advanced math, so you can become CS just be consistent and believe in yourself.