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Using_Khan_Academy_for_GMAT_Prep
Unless you know what you're doing, using KA will result in you learning a lot of math that you don't need to know for the GMAT, and not learning content that will help you in unanticipated ways. Don't get me wrong - I love math, and I love KA, and I highly recommend using it to learn all kinds of thing... after you get an awesome score on the GMAT.
I'm a coach on KA (something anyone can register for - not an official title) and most of my GMAT students are students on KA as well. That way, I can control what they learn and don't learn. Obviously, I can't do that for all of you, but I can give you a list of the common core standards that will appear on the GMAT:
First, you should register for an account on KA. Then, go to the common core map
Now, check out the attached pdf for a list of the standards you should work on. Keep in mind that you may already know a lot of this, but I'm trying to be as thorough as possible.
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John L Easter
Founder: Owl Test Prep
773.401.9445