Preparation for 70-680
Collection 6292: Installing and Configuring Windows 7 Client
Self-Paced Training Kit (Exam 70-680): Configuring Microsoft Windows 7
You should also review the Learning plans. These include specific links to additional resources that will help you with the exam. Most of these links are meant to give you an over veiw or a bit more detail into a topic. You are not expected to be a seasoned expert on every technology yet.
Learning Plan Two (ignore the reference to course 50322a)
Preparation for exam 70-686
Collection 6294: Planning and Managing Windows 7 Desktop Deployments and Environments
Self-Paced Training Kit (Exam 70-686): Windows® 7 Enterprise Desktop Administrator