GMAT Club tests are quite good for quant practice. Several folks have boasted about getting Q50-51 using these tests. I am using these tests mainly for quant. My general observation - questions are tough then actual gmat, but thats where you get prepared thoroughly.
Verbal - I havent seen any course providers come close to GMAT Verbal. Thus, wouldnt blame GMAT Club there.

Another thing I like about GMAT Club tests access is that you can choose a particular area and practice questions related to that area. Something I would recommend everyone, and has been suggested by famous guru Ron.

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