Kaplan is a well-known name in the test prep industry, but does that mean its ACT materials are good? The ACT prep book you choose can mean the difference between reaching your goal score or not, so you want to use a book that's right for you. Kaplan's materials are known for helping students (particularly lower-scoring students) learn the content they need to do well on the ACT, as well as preparing them for the exam's format and question types. However, there are other areas where they're not as strong.
This Kaplan ACT book review explains what Kaplan's ACT book, ACT Prep Plus 2021, includes, what its strengths and weaknesses are, and who the book is right for (and who will be wasting their time reading it).