Dear Student ,

Well, maybe you can't change your marks now.. But, this can't be a barrier for your learning or improvement of any topic/subject. You can recapture again your learned topics in B.com as a better way, try to get help from YouTube and other tutorial website for clearing any concept.

You can also opt correspondence course in B.com/M.com for  your subject development, as you know there is no age bar criteria in correspondence course , so you can easily opt your desired course and learn in better way.

For your guidance , you may go through this article :

https://finance.careers360.com/articles/courses-after-b-com

Hope my answer helps !

Best wishes !!