According to the news of Microsoft Official website, Microsoft 70-668 exam will be retired on July 31, 2016.

Before you decide to take Microsoft 70-668 exam, it is useful for the candidates to know Microsoft 70-668 exam topics. 

Designing a SharePoint 2010 farm topology (27%)

Planning SharePoint 2010 deployment (26%)

Defining a SharePoint 2010 operations strategy and business continuity (25%)

Planning for search and business solutions (22%)