Data Sufficiency problems are an integral part of GMAT and can get real confusing and at times even deceiving!
Beat The GMAT got hold of Brent Hanneson who is a veteran GMAT Instructor to create a series of Videos, 14 to be precise on Data Sufficiency!
All these videos cover a lot of concepts and are super useful!
Check it out!
http://www.beatthegmat.com/mba/gmat-data-sufficiency-videos
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