Look if you have access http://mylearn.vmware.com/mgrSurvey/assess.cfm?item=23551&user=0&refer=0&p=0&ui=www_cert
Find blueprint of this certification, can help.
Look tooo
http://fojta.wordpress.com/2011/06/14/vca4-dt-exam-experience/
http://myvirtualcloud.net/?p=1879
good luck