As the late Sandy Thomson, an absolutely superb teacher
(Pre JAR jurisdiction last century) said “high class rubbish”.
My view is that it is ‘high volume, low grade’ material to absorb.
Provided you have adequate grey matter, you put in the time and effort,
it is mainly learn and churn.
The NAV paper does require a measure of understanding (fewest facts to learn) as does certain aspects of the MET. Keep asking the Question WHY.