Hope you and your family are doing well.
Yes , you are eligible to do a CA irrespective of your stream in class 12th.
CA is one such course that doesnt restrict the entry on the basis of your stream in 12th.
However , you need to put extra effort at the time of your entrance exam of CA ie CA foundation in order to get the basics of accounting on tips since people from the commerce stream would have an edge in this.
Hope this will help.
Have a nice day !!