Don't cause yourself stress by concentrating on negatives.
Don't be afraid to admit you don't know the answer to a question. It's better than faking.
Interact subtly on the company's social media - maybe like a post.
Be authentic, cheerful, self-confident, candid and to the point.
Don't brag too much. Humility is persuasive.
Thank the interviewer(s) in person, by email or by post. Common courtesy and politeness goes far in interviewing.
Dress for the occasion. Dress stylish and tidy.
Job Hunting Tips:
"Create your network of contacts. As soon as you have chosen a career or particular job role, interact with important people in that sector or company. Many people are able to offer you an insider’s take on things and can help to fill your professional network, creating extra opportunities. Your professional network can also contain contacts like family, classmates, teachers, and contributors."