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Below are the 7 official tests released by ACT over the years in PDF format. The answer key is at the end of each document.
When attempting these tests, start with the most recent one and work your way back in time.
Math: The Math section has gotten progressively more difficult over the years, so the 2021-2022 test is a better representation of today's Math section than any of its predecessors.
Reading: Another recent development is that the Reading section now has a paired passage. This appears in only the three most recent tests (2021-2022, 2018-2019, and 2015-2016).