Here is the link for the preparation guide for Exam 70-562 TS: .NET Framework 3.5, ASP.Net Application Development.

The skills being measured includes:

1. Configuring and Deploying Web Applications (10 percent)
2. Consuming and Creating Server Controls (20 percent)
3. Working with Data and Services (17 percent)
4. Troubleshooting and Debugging Web Applications (16 percent)
5. Working with ASP.NET AJAX and Client-Side Scripting (15 percent)
6. Targeting Mobile Devices (5 percent)
7. Programming Web Applications (17 percent)