You can register only after getting a transcript in your name. Hands on experience is something you need to get familiar with the technology. But without qualifying training you cannot take up the certification.
Recently VMware made many changes to their certification Roadmap. You can take up VCA-DCV(Associate level certification) without and required qualifying exam. Take a look ta the VCA-DCV blueprint here.
One more thing is, If you are certified in either VCP-Cloud or VCP-DT you will not need the qualified training. If this is your first VCP you will have to undergo the training and then take up the certification.