Answer questions slowly and clearly. Pause before phrases. Ask for clarifications if you didn't understand the question. And avoid slang, jargon or regional phrases and affectations which will lessen your chances of getting understood and picked for the job.
First impressions are last impressions Projecting a professional image is also essential.
This includes being neat and well dressed. Suits and ties for men and business outfits or formal wear for women are ideal. Many cultures have stricter conventions regarding dress and manners. Do your homework on the country in which you will be relocating. You might be asked about your knowledge about the cultural practices of the country during the interview.