Contrary to the old exam 70-536, which versed on version 2.0 of the Framework, there are no new exams that explicitly test
only your knowledge of newer versions of the Framework. Instead, there is a whole series of exams that deal with "higher-level" technologies (such as Web applications or Windows Store applications). These exams require knowledge of the Framework. However,
they are not explicitly a test of your knowledge about the Framework itself, but rather about things that you build on top of the Framework.
One exam that you may consider is 70-483, "Programming in C#". Despite its title, it deals more with the Framework than with the C# language itself. For instance, it covers topics such as "creating and using types" or "managing multithreading" or "managing
assemblies", which are essentially testing your knowledge of the Framework.
Take a look at the page on Visual Studio Certifications, which links the various exams that might be realted to the subject of software development under the Framework 4.5:
http://www.microsoft.com/learning/en-us/visual-studio-certification.aspx
