The way I prepared was to just know what I would say but I did not necessarily practice my answers. I had one on December 7th, and what I noticed was knowing what I wanted to say but responding in that moment made it more real and made me feel more comfortable in my skin. I felt that when I was practicing consistently, I would miss something and would become frustrated with myself. So, I decided, know some points I want to hit and hit most of them.
I also just did a more research on the site and the team at the site to know who I would potentially meet. It is super anxiety-provoking but it helped me a lot!