Lynda.com has very good trainings on Excel. Depending on what your main duties and responsibilities are, you pick the one that benefits you the most, and take a look at the main points/skills for each area to study.

For exam, if you are FA, you might want to check out the Financial ananlysis and/or Macro part. They have sample video clips you can watch for free. If you don't want to subscribe, at least you will know your skills to improve upon.