I'm not sure why any PY candidate would want to wait until they have additional work experience. The exam is based on the legal, ethics, and behavioural finance theory taught in their degrees. The exam questions are mostly based on sensationalised, unrepresentative, historical case studies, and have little in common with the real world work experiences PY candidates are likely to encounter. Might as well do the exam ASAP after studying the theory.

Then again why have the exam at all anymore, since all new entrants are already being examined on that theory as part of their (now) compulsory degrees.