ACT and SAT test prep materials can be expensive. Here are some FREE online ACT and SAT prep tools.
ACT Prep
Varsity Tutors
https://www.varsitytutors.com/act-practice-tests
The Princeton Review
https://www.princetonreview.com/college/free-act-practice-test
SAT Prep
https://www.princetonreview.com/college/free-sat-practice-test
Khan Academy
https://www.khanacademy.org/sat
ACT & SAT
Prepfactory
https://www.prepfactory.com/
Powerscore
https://www.powerscore.com/sat/help/content_practice_tests.cfm