Official guide for exams
70-270 : Installing, Configuring, and Administering Windows XP Professional
70-290 : Managing and Maintaining a Windows Server 2003 Environment
70-291 : Implementing, Managing, and Maintaining a Windows Server 2003 Network Infrastructure
70-293 : Planning and Maintaining a Windows Server 2003 Network Infrastructure
70-294 : Planning, Implementing, and Maintaining a Windows Server 2003 Active Directory Infrastructure
70-297 : Designing a Windows Server 2003 Active Directory and Network Infrastructure
All for only €130 and I will throw in 1 year of enterprise MSDN subscription software which will enable you to practice with live environment(s)