To memorize the material immediately, to the end, and completely not worth it, it is more useful when you first get to know the material to memorize not everything, and only after a while you can turn to it already for the purpose of memorization.
In psychology, there is such a thing – reminiscence, i.e. after a while more is remembered than previously recalled. But if you memorize the text tightly, then delayed playback will not improve, but it can get worse.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.