what is preferable doing job or higher studies after B.pharm to earn more money?
As far as money is concerned then according to me MBA after b.pharma is one of the best option to exercise. I am not saying that there aren't any other fields, there are but money is much there.
After your graduation you can simply take admission in tier-1 colleges for MBA like top IIM'S after qualifying CAT cutoffs.
You can also go for m.pharma or Pharma D after your graduation.
All the best!!