USA

First of all, you should maintain over 3.0 GPA out of 4 GPA ( American standard) in your Bachelor's degree which means over at least 70 percent marks. You should appear for GRE and TOEFL exam, and crack both the exams with good marks.

Since, it's a management degree, you will be recruited by pharma or health sector mainly. You may specialize in other fields like data analysis to work in research. While pure pharmacy degree in STEM, management is not exactly a part of it.

As per the world ranking USA is the best and here are the schools:
1. University of Chicago - Booth School of Business
2. University of Virginia - Darden School of Business
3. Dartmouth College - Tuck School of Business
4. Harvard Business School
5. University of California at Berkeley - Haas School of B

IELTS or TOEFL both are considered equally by most of the colleges. What you need to see is in which pattern you can score better so take a look at their details or take a mock test and see what suits you best.

Your scores are less and it will create problem while getting visa.

Yes, you can pursue MBA after writing GMAT, TOEFL or IELTS.

Kindly, mention your academic history, all the scores, TOEFL or IELTS score and your course area of interest.