For those of you that are looking to brush up on a few skills prior to starting the MBA program, GMAC's Essential Prep Collection may be a good option. The entire collection comes with tutorials in Accounting, Finance, Quantitative Skills and Statistics and gives you access to online materials for an entire year. If you don't need the whole collection, you can just purchase the tutorial that you need most.
You are interested in applying for the Fisher MBA program, but you are worried. You have matured a lot since college and, looking back, realize that you possibly didn't make the most of your undergraduate experience from an academic standpoint. You know your GPA isn't reflective of your potential. You have been out of school for awhile and are a bit rusty at taking tests, especially standardized ones, so your GMAT performance isn't all that compelling. You have, however, been very successful in your career and believe you have what it takes to be successful in the MBA program.