Reddit mentions of The Complete Guide to ACT Reading, 2nd Edition

I would recommend Erica Meltzer's books on ACT English and Reading sections. They're a bit pricey (>$29), but I've heard that they are excellent resources at tackling those sections.

https://www.amazon.com/Complete-Guide-ACT-English-2nd/dp/1530072808/ref=sr_1_5?ie=UTF8&qid=1497577726&sr=8-5&keywords=erica+meltzer

https://www.amazon.com/Complete-Guide-ACT-Reading-2nd/dp/0997517824/ref=sr_1_2?ie=UTF8&qid=1497577743&sr=8-2&keywords=erica+meltzer+act

https://www.amazon.com/gp/product/0996832203 - science (Really helpful)

https://www.amazon.com/gp/product/0997517824 - Reading (Really helpful)

I'm very skeptical when it comes to buying books that promise that they'll help me out. When everyone told me to buy these books, I believed they were lying about how good they were; however, when I read these books, it made the ACT test seem so much more simple. Also, as sk0620 said, taking a bunch of practice tests help out a lot. Every day, I do a section practice test to better my skills.

There are a ton of strategies online you could use to improve your reading speed (just google them) and using effective reading strategies also helps. Some people deep read while others skim and refer back, but when it comes to reading those strategies are really subjective so find out which one works best for you. The MOST IMPORTANT strategy for reading is to NEVER answer the questions in the order ACT gives you. For example, you should answer questions about general summation last and questions referring to specific lines first. This saves A TON of time. As always, practice makes perfect. The most useful practice book for reading I've found is this one https://www.amazon.com/gp/product/0997517824/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
For science, organize the passages into difficulty levels and come back to the more complicated passages (or passages that require reading) after you've finished the easier ones for the science section. This will save you a significant amount of time.
Hope this was helpful! :)

I believe it does:

https://www.amazon.com/Complete-Guide-ACT-Reading-2nd/dp/0997517824