Improving my ACT score

So I took the ACT for the first time and I got a 21, I’m not sure if that’s considered good or not. During the test I felt really rushed and I didn’t have that much time and usually had a few questions unanswered (like 5-10), I was wondering if anyone had any tips, review books, or material that I should study so I can improve my score, thanks!

Have you tried taking the SAT? Most students who have a problem with running out of time on the ACT fare better on the SAT.

Yea I took the SAT, I feel like I had better time management compared to the ACT, I’m still waiting for my score