I just went through the RMA's, and the Business Acumen testing can be tough, even for seasoned associates like myself.
Specifically, you will want to familiarize yourself with the metrics:
GM (Gross Margin)
How it is determined
How to increase it
GMROI (Gross Margin Return on Investment)
What affects GMROI
Ways you can increse GMROI
Also, make sure you have a solid understanding of the P&L (profit and loss statement)
The P&L and questions regarding it can be confusing. Just remember, all the answers are on the left side of the sample they give you, not the right. (it's confusing when you look at it)
Make sure you feel comfortable doing algebra, because you'll need it on the last few questions.
Also, be prepared for a pretty in-depth interview again with a store manager and human resources manager. You will want to have some pretty specific examples for the questions they ask.