Every year ACT releases an official practice test that is provided to students as a sample test. Here I have listed links to seven unique publicly disclosed tests released by ACT over the years. These are the only seven unique tests released by ACT (current as of August 2021) over the years, the rest are repeats of these same test forms.
Preparing for ACT 2021-22(Form 2176CPRE): (PDF)
Identical to 2021 April ACT (Form Z04)