If you're talking about IPM at IIM Indore, I would say being a student here, that IIM Indore generally looks for students who can stand out among others.
In terms of WAT, reading articles helps a lot. You come across numerous themes, which helps you gain knowledge and build a good vocabulary.
For PI, study current events and trends and be prepared for odd questions. They will not only test your knowledge but also your IQ. As a result, the key to acing your interview is to respond with honesty and confidence.
I hope this piece of information is useful for you all and gives you a basic idea about how to start your preparation for WAT and PI.