There is an old adage that goes "Know Your Enemy". It means that you will do a better job of defeating an enemy if you know a lot about them. If your enemy is the other person trying to get the same job you are, then rewrite the adage to say "Know Your Company."
If you have done enough legwork to get a job interview at a company, don't stop your hard work there. Especially with an entry-level job as a new college graduate, you are going to have a lot of competition. You probably are already at about the same level in terms of experience and education as all of your competitors. So, what are you going to do to make yourself stand out on that job interview?