Interview can make a difference?

Hi all, my son just did an amazing interview with his dream school! He is so excited!!! It lasted for 1h15m. It was incredible!!! So much in common :). How can an interview make a difference?
P.s.: sorry for my English, we are international.

It depends on the school. If you do an internet search for the college name and the phrase “common data set”, section C lists criteria that can be used to evaluate an applicant. Each school will designate the level of importance an interview will have in the process.