The PPL is NOT a prep school for an ATPL. Too many people have this attitude to it.
It is a leisure licence for the recreational pilot. What is required in terms of knowledge is what is needed for safe operation of a flight.
Does the candidate know the rules of the air, what VFR limits are, how the engine works, what to do if the oil pressure stays low after start-up, how to plan a VFR route, decoding a TAF, what the effect of icing is, etc.
Publish all the facts they are required to know in a Q@A book. If the VFR limit for an aircraft flying at less than 140kts IAS below 300 ft in Class G airspace is 1500 metres, if they have memorised this and know it, then how they have learnt it is IRRELEVANT.
This culture of secrecy advocated is utterly stupid.
The aim is to be inclusive at the private level. The "chop" mentality can be left to the commercial ATOs and the military.