DOTNET certification

[kuwl_mark]

dear friends i am preparing for dotnet certification.Can any body help me in it. I want to know where to start?? how many exams are there? where will i got material for the same. Can I get Previous papers for the same. do u have some good links for the same

[eyeseetee]

http://www.microsoft.com/learning/mcp/mcsd/requirementsdotnet.mspx

[kuwl_mark]

Actually I am looking for previous years paper can i get that :)