The Application Process

Okay, so I've already been accepted and will be attending this fall. I have a major in Economics and a minor in bus. admin. But that was more than five years ago. I am obvously rusty (even after GMAT studies). My question is... what should I do to prepare for the rigor of an MBA? I have found two different MBA online prep courses. I was wondering if any one could shed some light as to which is better (or your opinions)? Thanks.

The two are:
Essential Prep from the GMAC found here https://www.essential-prep.com/student.html
MBA math found here https://www.mbamath.com/status/admitted.htm

The main difference I can find is GMAC one is $200 and MBA Math is $150. The MBA Math is much better at explain what it has. The GMAC one is a little vague (and their demo is incredibly easy). The MBA math also has Economics, while GMAC one doesn't. MBA Math also shows you how to use spreadsheets. From this it seams that MBA Math is the better deal. You pay less and get more. Has anyone used either of these courses? What's everyone's opinion? Thanks.

I haven't used either source, but having been through an MBA program, I would say that statistics, accounting, and finance are the most difficult classes for people on average. Try to get some exposure to these classes.

MBA IQ is another one that I have heard good things about, though I have not enrolled in any and question...is it really necessary? Did your program recommend it?