Hi Monir,
I used the test exam suit that came with the mspress book and found this to be sufficient to revise for the exam.
If you are looking for additional practice exams you should use one of the following,
Measure Up -
http://www.measureup.com/Site/display_article.aspx?id=955
Self Test -
http://www.selftestsoftware.com/dept.aspx?dept_id=1000
This is also outlined here in the recommended preparation guide from Microsoft, http://www.microsoft.com/learning/en/us/exam.aspx?ID=70-640&locale=en-us#tab3
Best of luck with the exam,
Jarad, MCITP, Brisbane Australia