Do any one have books or study material for ARC GIS Desktop Associate , i can also buy used books .
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The ArcGIS Desktop Associate 10.0 certification is already quite specific about what it seeks to test.
If the suggestions offered on its Preparation Resources tab are unsuitable or insufficient then I would recommend that you seek terms from its Skills Measured tab for searches against this site and the ArcGIS Online Help.
For example, "arcgis supported data formats" yields many hits from both sites:
Since you are looking for a book, there is one published by Esri Press recently: