Hii,

After earning your diploma, you can enroll in a B.Com program, though this will depend on the policies of the college and university. While some colleges may require a 12th pass, others permit diploma holders to enroll directly in B.Com programs.

The college where you wish to apply should be consulted. You can be admitted if they accept your diploma as being on par with your 12th grade diploma. For precise information, always consult the college office or the admission notice.