Is there a test as part of the interview process> If there is, the key thing to remember is that while getting the answer right is important, the most importan thing is showing overall competence, so if you get there and it all goes horribly wrong, explain in the interview what went wrong, what you would have done to fix it, how you would have answered the questions had things not gone horribly wrong etc. In the interview I had to start here I went into the interview knowing I'd gor the results from the Excel test wrong so I started my presentation on it by saying, I know these numbers are wrong, but assuming they were right, these are the conclusions I draw...

As you're interviewing within the company you already work for be careful you don't exaggerate your achievements too much (as they may already know who you are) and don't dish the dirt on any other section.

The questions I normally ask when I'm recuiting to what sound like similar roles to this relate to why do you want the job, what do you think you'll bring to it, ensuring accuracy, communicating results of analysis to general audiences and something on team working.