VCP6-DCV has a minimum training requirement of 1 course - so ICM, Optimize & Scale, or others.
Each of the 2 exams you'll have to take haa recommended training:
vSphere Foundations = vSphere ICM
VCP6-DCV = vSphere Optimize & Scale
You could take both courses and do both exams, but you don't have to - 1 course and the 2 exams will suffice.
Check the requirements here: VCP6-DCV Certification
Follow the links on that page for the 2 exams and you'll see the course alignment I mentioned above.
But, whichever courses you take, you'll need to know more for the exams - you can review the objectives of each exam.
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