If the CR book you tried hasn't helped, have you tried a videoapproach?
See if this video helps: http://www.gmatpill.com/criticalreasoni ... Estate.mp4
http://www.gmatpill.com
...
See if this video helps: http://www.gmatpill.com/criticalreasoni ... Estate.mp4
http://www.gmatpill.com
...

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