Kaplan Tets Prep's "Police Exams Prep 2018-2019: 4 Practice Tests + Proven Strategies" is accessible, straightforward and well organized. There isn't anything fancy in it but it has the tools needed for test prep: practice tests (4), chapters devoted to the topics to be found on the test and strategies for preparing. The first four chapters cover police careers, the application process, the exam and strategies for the exam. These four chapters are worth a good look as it gives a solid overview of the process. After that, the guide focuses on the exam topics and practice. As noted, there isn't anything fancy about it and I think that is its strength.