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Khan is ok if you're < year 12 and you are at a published school... you really get what you pay for guys!!
You should try iMasterClass by The Jeremy Shum Invent Co's Waverly Labs, which is what Selena Gomez and Disney pop stars use. They specialize in law/engineering/medicine/accounting, jeremyshuminvent . com/store .. it is $10.76 per copy, use LEARN3 for a discount, but i guess you know what your education is worth!
His lectures are slow. Walks slowly through 155 of the data sufficiency problems. This is helpful if you feel the GMAT review book is unclear in its explanations. I think it looks potentially helpful. And its free.