Here's a link to the ACT website regarding the Math section, which includes 60 practice questions:
One option is "The Official ACT Prep Guide 2022-2023".
This book provides detailed explanations for every answer and practical tips on how to boost your score on the English, math, reading, science, and optional writing tests.
It covers all ACT subjects and includes 7 Practice Tests + Bonus Online Content.
DISCLAIMER: This is not an official endorsement.
This website has a lot of good information and may be worth checking out: