If you wish to get the most out of your college life, you will have to carry on with a very busy lifestyle. There will be classes, loads of lab work, studies, extracurricular activities, going out with friends, for dinner, ordering pizza, playing video games, movies, and a lot more things. You will be independent and decide what is good for you and what is not.
You get a lot of freedom in allotting your time to various activities. The teachers that usually teach you, make the most of the time and are experts for this. The labs are well built. The hostels are equipped with all kinds of amenities. The college has good sports facilities. But in the end, IISER is for those students whose major goal is to do research. For others, it is quite difficult then.