Current 1st year Waterloo optom student here - congrats to everyone who got interviews, I've gotten some messages so just to respond to a few questions from above:
1. Guests- I think you're allowed to bring anywhere from 0-2 guests along for the tour of our school
2. This year, we have 91 people, so maybe they'll accept 92 people next year, who knows. But for the past few years, they said at the interview around 300-350 people apply, 150-170 people interview, 90 for the class.
3. Interview prep- Since there's only a few days left before the big day anyways, I would just say think about your past experiences and self-reflect on who you are as a person, your values, etc. There isn't really any optometry-specific knowledge that you need to know- the interviewers aren't there to trick you, they just want to find out more about you.
Best of luck to everyone, hope to meet you next year!