Books to improve ACT math score

Hi everyone. I recent took the ACT at the end of my sophomore year (June 2018), and scored a 32 composite. I was satisfied with my English and reading score (both 34)and my science score (32, but I think this is a fluke this since I’ve gotten a 36 on the official practice tests multiple times in testing conditions). So in order to improve my composite score to reach my goal (34+), I need to improve my math score (29, I sort of expected this score based on practice tests). Do any of you recommend any books or sources to improve my math score? I lightly used Ultimate Guide to the Math ACT by Richard Corn before the test, so I’ll study this more in depth before my second attempt this fall.

I found ACT Up on the app store and the official ACT Online Prep to be very useful since you can download the apps on your phone and practice in your free time. ACT Online Prep is also great for getting feedback on mistakes with plenty of practice questions. If you need to brush up on concepts, I recommend McGraw Hill’s Top 50 Skills for Math and Princeton Review’s Cracking the ACT for managing time.