Some resources;
VMware Certification - This is the VMware root resource with links to each of the various tracks available.
Within each track you'll find a blueprint for the certification e.g. VCA6-DCV Certification Exam, this is the recommended topics to study for the exam (hint hint)! Including Links to training and a practice exam.
If you are a partner there are also training resources available within the VMware partner portal; VMware Partner Programs: Requirements and Benefits
Pluralsight have within there catalogue a range of VMware courses, David Davis instructs a foundation course, with more advanced specific DCV training available from Greg Shields.
To sit for a VCP exam, you must first have passed one of the foundations exams e.g. vSphere 6 Foundations Exam
Here are some wider community resources for VCP study;
https://vbrownbag.com/vbrownbag-technology-series/vbrownbag-vmware-certified-professional-6-data-cen...
https://virtual-simon.co.uk/vcp6-5-dcv-certification-blueprint/
https://thesaffageek.co.uk/vsphere-6-x-dcv-study-resources/vcp6-dcv/
Free unofficial study guide for VCP6-DCV exam
Hope that helps
Simon
https://virtual-simon.co.uk/
