Tips I use.
Search the net for other people's tips. eg PPRuNe or that site that has the pay etc for airlines (can't remember the URL)
Brush up on general aerodynamic principles
Search out the relevant company's website or give the secretary a call to see if they have a 'standard" flyer or something.
You cannot know too much about the company!!
Ask a mate (if they work for that company)
Look up the fleet's details.
Practice answering questions out a loud. eg CRM topics.