Note that (at the time of this writing) IaaS covers vCloud Director 1.5 while the VCP-Cloud exam is on 5.1.
VMware Learning has free videos on vCD, You can also look at some of the white papers
http://www.vmware.com/files/pdf/VMware-Architecting-vCloud-WP.pdf
Your VMware Private Cloud: Evaluate and Architect Your Virtual Private Cloud
You might look at VCAP-CIA resources also as it is the hands-on (and advanced) version of VCP-Cloud. Note that VCAP-CIA covers 5.1