Hi Ken, thanks for submitting your question. Unfortunately, drivers are required to have at least two years of driving experience before they can apply for the Private Hire Car Driver’s Vocational Licence.
You may read more about the rules and regulations here: https://www.lta.gov.sg/content/dam/ltaweb/corp/PublicTransport/files/FAQS_for_PHC_drivers.pdf
I may have misread your question. A PHV may have a P-Plate, but the driver providing the service cannot be a P-Plate driver.