Distance

You can evaluate and register for Ph.D through distance learning from IGNOU or AMU - AIMA.

Applied and interdisciplinary courses provides multiple career options, I would suggest you to go for applied chemistry.

For correspondence courses, Sikkim Manipal is the best university.
You can check the below mentioned link for the list of colleges:
https://www.way2college.com/colleges/msc/bangalore

You can try for School of Open Learning (SOL) at Delhi University.

You can go for NMIMS and Symbiosis University distance education programs. Both the institutes provide a good brand name and 100% placement assistance.

Class room coaching is better for MBA. It is my personal advice after being in the management education sector for over 40 years. If you have university or a colleges offering MBA evening program, it is better than distance learning.
Live class room discussions and interactions are the most worthy part of MBA education. You should understand this sincere opinion and look for an evening class room program.
All the best.

You can check the below mentioned link for the colleges offering distance MBA:
https://www.shiksha.com/top-10-institutes-for-distance-correspondence-mba-article-6301-1