First, your own clothes. Generally speaking, you can dress elegantly and neatly in the interview. If you want to have more impression on the enterprise, you can wear a suit to pay more attention.
Second, talk. Whether you ask questions or answer the interviewer's questions during the interview. Speak clearly and neatly. Express and describe clearly.
The above two points need attention. Of course, some basic preparations should be made before the interview. (for example: resume, bus route and some basic knowledge of the company, etc. ).
Even in a group, we should calm down and give proper answers. Ask if you want to know anything. Remember, dressing, speaking and being polite in a group are extra points. The above is my personal opinion.