Interview Help!!!

Hi Everyone
So I got a Skype interview from a UPenn alum. I am applying for Mechanical Engineering in the SEAS. This would be my first interview so I require some help.
I am from India, so, does getting an interview actually mean something? Or is it just on a random basis?
I am asking this because two of my classmates applied as well (to Computer Science) but didn’t get an interview but they had a better SAT score than me (approx. 60 points more). I didn’t apply for financial aid so does that make a difference?