What practice tests should I do?

From intense research, I have concluded that taking ACT practice tests will make a major change on my ACT score. So is there a practice test from any book in particular that I should take practice tests from? I know about ACT’s official study book but my mom refuses to buy me anymore study materials ( the books are too expensive). Other than that, I found some old ACT tests online that I will use. I am also using the Princeton Review Cracking the ACT and will use the tests from that book… Y’all got any other suggestions?
Thanks!!