Reviews the subjects covered on the ARRL licensing exam, and provides a pool of questions currently used in the exam as well as cross-references to answers for specific questions within the text.
The exam structure is quite conductive to just memorizing the answers [4], but it is really better if you try to have some understanding so I recommend the books.
You can take practice exams, or drill with flash cards, or review the entire question pools at hamexam.org or hamstudy.org. Make accounts at those sites and they will keep stats on how you do for each subsection of the test questions so you can figure out your strengths and weaknesses.
There are mobile apps for iOS and Android that provide functionality similar to hamexam.org and hamstudy.org.
[1] https://www.amazon.com/ARRL-Ham-Radio-License-Manual/dp/1625...
[2] https://www.amazon.com/General-Class-License-Manual-Spiral/d...
[3] https://www.amazon.com/Extra-Class-License-Manual-Spiral/dp/...
[3] See this comment for some more on the exam structure: https://news.ycombinator.com/item?id=15353793
Also all of these are open source submissions.
> How did “amateur” become “ham”? The real answer is unknown! Even before radio, telegraphers referred to a poor operator as a ham. Perhaps this was derived from a poor operator being “ham-fisted” on the telegraph key — an operator’s “fist” referred to his or her distinctive style over the wires. With all radio stations sharing the same radio spectrum in the early days, commercial and military operators would sometimes refer to amateurs as hams when there was interference. Regardless, amateurs adopted the term as a badge of honor and proudly refer to each other as “hams” today.
While you'd buy the latest 5th edition from the ARRL [1] to prepare for the exam, the older 3rd edition is freely available online [2].
[1] https://www.arrl.org/ham-radio-license-manual
[2] https://macaloney.blogspot.com/2019/06/how-to-prepare-for-ha...
[1]https://www.amazon.com/ARRL-Ham-Radio-License-Manual/dp/1625...