Hello student B.com has nothing to do with your MBA entrance examination. If you score good in your graduation your chances to get into top MBA college will increase.

If you've good academic background then yes it'll be easy to get admission in the institute you've me mentioned as there's weightage for marks obtained in class 10, 12 and graduation.

Top B.com colleges in Ahmedabad are as mentioned below -

St Xavier's College, Ahmedabad

Shri KK Shastri Government Commerce College, Maninagar

Government Commerce College, Naroda

Gujarat Commerce College, Ahmedabad

Government RC College of Commerce, Ahmedabad

Gujarat Arts and Commerce College Evening, Ahmedabad

I request you to please help me with your preferable college so that I can check and provide you the exact information about eligibility requirements and admission process as it vary from college to college.

For more details refer to the link mentioned below - https://university.careers360.com/colleges/list-of-commerce-degree-colleges-in-ahmedabad

Feel free to comment if you've any doubt

Good luck