The ACT is made up of the first 5 sub tests in the list below.
Practise each sub test as many times as you like to improve speed and accuracy. Train hard, pass easy.
You will (probably) never get the same combination of questions twice.
Note: The Resoning Categories sub test was not on the ACT when I took it, although it was in the test preparation booklet.
This free resource generates infinite Army Cognitive Test practise questions based on the official version here.
* Whilst final test scores aren't provided by this resource, speed and accuracy are used to calculate your score on the real ACT
DISCLAIMER: The question archetypes in each sub-section are based on the official ACT practice resource and only reflect the actual test to the extent that the official practice version does (although I, and those I know of who've used this resource to prepare for the ACT, thought it was spot on!)