Say thank you to your interviewer at the end and after by email or send a 'thank you' card by post.
Check that your recent linkedin messages are not unprofessional.
Think of perceptive questions to express that you're curious and have thought about the opportunity.
Analyse typical questions and write down your replies.
Advice for those looking for employment:
"Whatever jobhunting plan used, following up and making sure you keep tabs are essential for earning that role. Individuals that don't record such info frequently forget important contacts, besides favour with potential businesses."