If you want to actually learn the relevant material, but tailored toward passing the exam, the ARRL books are very good [1] [2] [3].
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.
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