What is the best way to prepare for the Extra...?
Read posts by W8JX in "licensing" as he is THE
Seriously though The Navy produced an excellent manual "Radioman 3&2" for many years .
Any of W6SAI Bill Orr's radio handbooks .
As far as current licensing study goes it is a fine line between memorization and learning . Learning is defined as a reasonable change in behavior . My personal change in behavior has been teaching what I learn .
Memorization is just that . I agree that the recent ham that memorizes the exam will have nothing to teach .
You can use the question pool and the online practice tests to find what is required and due diligence is up to you .
You will find that most amateurs will jump at the chance to teach . Contact your local radio club and see what happens .