IIM Calcutta - Indian Institute of Management

Not all the network marketings offer you a certificate of work experience but if your company is ready to give it then it's good but you still have to get 98.5+ percentile in your CAT to be eligible.
Good luck.

For the admission notice and the dates to abide by, please keep yourself connected to their website where the information will come. You shall need to be updated with General Awareness/GK/Current Affairs and Media Literacy as well. For more information please read the content already available on Shiksha
Checkout this Question on Shiksha
https://ask.shiksha.com/how-should-i-prepare-for-the-entrance-exam-of-iimc-the-indian-institute-of-mass-communication-qna-3560128.

Yes, you should appear for CAT exam and clear it too with a good score like not less than 98 or 99 to get into an IIM.

IIM Lucknow is better in terms of placements and education however every IIM is excellent in their term. So, decide as per your convenience too.

You must get above 95% for any IIM and for the Kolkata try getting at least 98-99. Scholarship gives leverage in fees only not the eligibility criteria.

Yes, you can pursue MBA in Pharma and there are many colleges that provide this course.