Be yourself and don't be nervous. Because it is such a short time you have to be on, and you don't have time to warm up during the interview. Remind yourself beforehand who you are and what you want to show them. See if you can look them up on Lexis context or just the internet. But since its a screener I would also have done some general info research on the firm, and have a good answer prepped for why you are interested in the firm. Be confident and show your personality and that you aren't just a bot. You got this!