Hello Ratan,

There's not really specific tye to it a large variety of students get into IISER and it doesn't have much to do with being jolly or happy type of a person.

There are the ones who were highly passionate about science and always wanted to go to IISc/IISER

There are the ones who were unsure about their career paths, and choose IISER because it’s an Indian Institute

There are the ones who wanted to go into engineering/medicine but didn’t get their desired college, so joined an IISER instead

And there are a few who had joined an engineering/medical/science college but didn’t like it there and came to IISER

You can clearly see that there’s a lot of diversity. There’s athletes, musicians, FIDE ranked chess players, gamers, quizzes, actors and people who are trying to find their way.

It’s a nice mixed bag really.

Hope this helps.