Practice what you might have to say ahead of the interview. Don't write it down and memorize it, but answer potential questions several times. Actually say it out loud, so you feel more comfortable when it's time to do so in the interview.
Record yourself practicing. Listen for your accent patterns. What words are difficult to say or to understand? Practice those words separately, and in short phrases.
For example, if you're in marketing, and you're talking about a project where you increased customer engagement, practice "customer" and "customer engagement" and "increased customer engagement," etc.
Come prepared to do some small talk. If you need help with understanding what it is, why you should do it, and how, take a look at the video and links below: