Other than understanding the fundamentals of what you are being interviewed on:

Be enthusiastic about the subject area, show genuine curiosity about the interviewer’s work, give the interviewers your undivided attention and ask relevant follow up questions when it makes sense. Basically pretend that you are on a date.

If you are bilingual and want to improve your engineering communication skills, try to explain technical concepts in a non English language. I usually practice discussing technical topics with a friend in Marathi (which I’m weak in) to force myself to really understand what I’m talking about.

Overall, be very positive and enthusiastic during the interviews.