After completing B.com you are not required to apply for CA CPT, ICAI issues direct entry to next level course of CA, As per the eligibility you must have completed graduation or post graduation in Commerce stream with a minimum of 55% marks in aggregate of all subjects or its equivalent from a state or nationally recognised university. You can check the furtehr information with the given below link.

https://finance.careers360.com/articles/ca-cpt-eligibility-criteria

If you want to know the other options after B.Com The other options you can go for Masters programme like M.com or Master's in Finance and Control as an option in the field of Commerce, MBA in Finance- It will help you to enter into the corporate world.
Commerce students can also join the Indian Economic Service or Indian Statistical Service. The Union Public Service Commission (UPSC) conducts the entrance exam to these services.

Good Luck!