I've practiced a bit for the ACT, but I'm still scoring lower than I would like on the Reading and English sections (22 in Reading and 28 in English as opposed to 34 in Math and 35 in Science). Which prep books should I use to improve my scores on those sections?
The best prep books that specifically cover the English and Reading sections are The Complete Guide to ACT English and The Complete Guide to ACT Reading, both by Erica Meltzer. These books will give you realistic practice materials and solid test-taking strategies. They also identify every type of question you might see on each section and provide you with the knowledge you need to choose the correct answers.
Source: https://blog.prepscholar.com/the-10-best-act-books-recommended-for-act-prep