How potent is b.com(h)+mba+cma(icwa) ?

doing m.b.a. from iim will defintely added value to your qualification but from other institute not so however  it gives some advantages.

It is as potent as you personally are. I have seen people with only an MBA from some unheard colleges earn handsomely and I have also seen CA CMA and CS guys rot in some crappy job. If you study to gain knowledge and apply that knowledge I dont think anyone will be able to put a number on how much you can earn. Only studying when you are really passionate to work in that field can give you satisfaction and great earning potential. All the best.