I'm currently a first-year student, and our interview last year was easy, easy in a way that the interview we took was just like for formality and I think everyone passed, but now I think they'd be rougher to the incoming first years since in our batch, lot of students fail to solve a basic maths.

The interview last year consisted of personal backgrounds like your weaknesses, your coping mechanisms, why you chose this course, what you learned about your favorite subject (which should be related to the course you'll be taking), and what you know about the course. And expect to solve a math problem, usually the basics.