I am an eloquent speaker in the classroom. But when I face a stranger outside, I get tongue-tied and nothing comes out.
You should pay close attention to your manner of speaking. Speech is a reflection of personality, you know. You should reflect confidence by speaking in a low voice, loud enough to be heard without being aggressive or overpowering.
I will go out of my way to catch the attention of the interviewer.
Your speech should not call attention to itself, but should reveal your individuality and ability.
I'm very shy. I think I might shake in my boots at the moment I meet the interviewer.
You'd better overcome your nervousness. it is considered an indication that you lack self-confidence.
Another problem is that I dare not look into their eyes whenever I meet strangers, especially foreigners.
In China, it is impolite to look into the senior speakers eyes while speaking. But in Western countries it is the opposite. Eye contact gives a strong feeling of sincerity. Looking downwards or sideways shows that you are either insincere or absent-minded.
Is there anything else that I should pay attention to in an interview?
Yes. Don't eat onions or garlic before you come. If you do you'll have bad breath.
I'll remember to bring gum with me.
You should never chew gum or smoke during an interview, even if you are allowed to do so.