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I am sending you an authentic link from where you get to know the best colleges for commerce in Punjab. Please check there. link-https://www.shiksha.com/accounting-commerce/colleges/colleges-punjab.

No, your interview and selection has been done based on the marketing management, so changing the course now is not possible.

In order to take admission in Masters of Computer Application MCA you first have to give CET exam. Once the result of your CET exam is out after that certain colleges are allocated to you as per the basis of your CET marks, out of which you can take admission in any one college. After this process visit the college where you have to take admission and they will guide you with the further procedure as per their college norms and fees etc. Once your admission is successful the college will confirm your seat. I hope this helps.