I have been selected for the PGP program of IIM indore, I have one and half months of time now. what could I do/learn to make my life easier at IIM indore?

First of all congratulations on converting IIM Indore. Now there are two things you can do before formally joining the institute.

• Option A - You can start searching for the course curriculum, preparing the subjects you will get in the first year, know about the probable faculties, etc. You can seek help from your seniors, interact with them and start learning as you will get a head start from other students of your batch.
• Option B - You can relax, and enjoy your free time. In the meanwhile, you can make some friends as well among your batch mates or even your seniors.

What I would suggest is option B as after the classes begin, you will hardly get any time to interact with anyone, and life would become hectic. So enjoy the free time you have now.