I remember knowledge by flying, and realizing that I needed it to complete the flight safely! It sounds silly simple, but it's a lot easier to remember something, when you realize that you actually need that information. At the beginning, it would seem as masses of information, with little practical application, but as you fly, all of those bits of information begin to find their home in your understanding of their need to exist.
I believe it was Bader who said: Regulation is for the guidance of wise men, and obedience of fools.
The information is there for you to use to fly safely. You may not have found how you need it yet, but fly long enough, and you will. Know that it's there, from people who have learned that lesson (the hard way) before, and took the time to write it down for you!