I have these ACT study books in my office that you can check out, as follows:
Real Act Prep. Guide McGraw-Hill's ACT Math
Kaplan's ACT Strategies Kaplan's ACT
Kaplan Prep Plus 2018 McGraw-Hill's ACT Math & Science
ACT for Dummies Cracking the ACT- Princeton Review
You can access ACT preparation, online practice tests with performance feedback.
Free online practice tests
Absolutely free, personalized practice for the ACT
ACT Academy™ is a free online learning tool and test practice program designed to help you get the best score possible on the ACT test, and well on your way to college and career success.