Are students supposed to look at the questions and work on them beforehand and discuss the solutions during the session or are they supposed to come with a clean slate like a real interview and work on them during the session?

The activities for breakout room sessions are structured so that students and coaches work together to develop solutions for the tasks at hand. Some students may look at the problems ahead of time to prepare, but you should assume that your students have not looked at the problems or solutions ahead of time.