Be informed about the organisation; its history, geographical locations, turnover, products or services etc.
Anticipate questions, factual or otherwise.
State why you are applying for the job and show you know something about it.
Present your qualifications in terms of having something of value to offer the company. Deal as much as possible in specific details and examples. Job experiences, responsibilities, positions held, achievements etc.
Remember the normal rules of etiquette.
Try not to discuss salary or required package at first interview. If asked, suggest you will be happy to discuss this at the next stage.
Never conclude an interview without some understanding about where you stand, what happens next, who is to contact whom etc.
Enjoy it – if nothing else it is a learning experience.