Hello Harsh,
It's good to see that you wish pursue CA after B.com. After B.com the candidates are eligible for Direct Entry Scheme by ICAI. If your average marks in your B.com is 55% or more, then you are eligible to pursue Chartered Accountancy professional course under the Direct Entry Route.Accordingly, you can register for CA Intermediate course, successfully complete one month course on ICITSS, and then join article ship. After nine months of article ship, you can appear for CA Intermediate exam.

Hope this info is helpful!!!