One of my friends joined IIM Lucknow and this answer will be based only on his experience and the advice he had received from his seniors. It may differ from now because his experience was 3 to 4 years ago.
Below are the pieces of advice that my friend’s batch received from their seniors:
Clothes:
Stationery and Computing:
Documents:
Hobbies and Entertainment:
You will learn a lot from your seniors once you are at the campus. I hope you will come out better as a person.