MBA Sales & Marketing

Yes, any graduate from a recognized university or final year students with a percentile of 50% and above in any of the accepted exams are eligible to apply for PGDM.

Kindly visit the link mentioned below:
https://www.shiksha.com/mba/course/master-of-business-administration-symbiosis-institute-of-business-management-lavale-village-pune-13280

No, chances are low at this score.

You will get a call for GD-PI round. Performance in GD-PI will matter your chances of getting into NLDIMSR.

It depends on the scores and GD-PI performance.

Digital marketing is a sub type yet emerging area of marketing and it may take almost 50 years to become digital marketing as a specialisation in MBA. You may opt MBA in marketing and may undergo certifications like Google certification in digital marketing. For MBA marketing, you may opt for ISB Hyderabad where admission is through GMAT. You need to prove your worth as a management student to get admission including cracking GMAT other options are ICFAI Business School, IPE, JNTU, etc.

Most of the B-School's have re-branded MIB as MBA IB. All three MBA specialisations International Business, Finance and Marketing have different focus areas. 60 to 70% courses for all three specialisations are same. Difference is only in electives in chosen business function. Business exposure of all different functions specialisation grads is same. You must choose your specialisation based on your interests to excel in professional career.

You have decent chances, provided you perform well in your GD and PI.