Perhaps you should take a few weeks to "test out" the courses. Most probably offer some sort of free content. Economist
GMAT Tutor offers a free 7-day trial. The free trial comes with a 1:1 strategy session with a tutor, so it's really worth checking out. If you're interested, check it out here: http://gmat.economist.com
. You'll be able to get a solid feel for what the course can offer you.
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Economist GMAT Tutor