If you want to become a VMware Certified Professionel (VCP5-DCV) is here my recommendation of studying. (Remember that you need to have attended an official VMware course)
Exam Blue Prints
Check the VCP blueprints (notic that there two available exams and blueprints) to figure out what areas you must read up on: Blueprints
Things to read
First read / go through the following PDF’s. concentrate on the things you don’t know too much about. You will get questions in all guides. It is all about the Blueprints! So use that as your guide through the following documents:
VMware vSphere Basics Guide
vSphere Installation and Setup Guide
vSphere Upgrade Guide
vCenter Server and Host Management Guide
vSphere Virtual Machine Administration Guide
vSphere Virtual Machine Administration Guide
vSphere Host Profiles Guide
vSphere Networking Guide
vSphere Storage Guide
vSphere Security Guide
vSphere Resource Management Guide
vSphere Availability Guide
vSphere Monitoring and Performance Guide
vSphere Troubleshooting
VMware vSphere Examples and Scenarios Guide
Configuration Maximums for VMware vSphere 5.x
All docs can be found here: http://www.vmware.com/support/pubs/vsphere-esxi-vcenter-server-pubs.html
I Would also recommend you to read Mastering VMware vSphere 5.5 by Scot Lowe
Take this free course VMware VCP-DCV 5.1 Exam Preparation Workshop (online – 4 hours)
Mock Exam
After doing a lot of reading it is time to test your self on the vmware vcp mock exam. You can find the mock exam here: VCP 5 Mock Exam
I would also recommend to use Virtual Exam Collection they are have a lot of actual test questions
When you are confident enough book the test. You can book the test at Pearson Vue. The test consists of 85 questions. Good luck 
VCP Quiz
Here is a list of VCP quiz’s to test you’re knowledge
Simon Long’s website here
Frank Brix’s website here
Elastic sky website here
Mike Preston website here