Before you PAY for anything, perhaps you should avail yourself to the FREE resources available through the Member Gift Bundles.
Also, be sure to check out the content on the Communities pages on myASQ. I recommend the Six Sigma Forum pages.
Before you take a course, check out YouTube for the online tutorials. This is a 10 minute video from the ASQ Statistics Division.
There is no way to cover everything in a 40-hour class. And that said, there is nothing like prepping with the free resources that Dan Zrymiak referred to.