India

There are no colleges that offer CA coaching along with B.Com. You can pursue B.com and opt for CA coaching separately through an institute of your choice.

State universities have higher reputation for the education they provide, also there acceptance is wider.

IGNOU is the best. You can try for the admission.

To pursue MBA from a good college, anywhere in India, one has to appear for an entrance exam and clear the required cutoffs to qualify for the further interview rounds to get admission. No reputed college admits candidates just on the basis of their graduation marks.

Yes, you can change it. But, time is strictly limited. After registration in science, you can't change this.

Hi Pawan,
The most important factor here is the quality of education. If you are getting good education after paying hefty fees in private college and if it is affordable for you, then you should take it up in India else you can consider going abroad.
The Indian government is very soon about to implem