There are effectively 4 days left to prepare for this weekend’s ACT (5 if you are taking it on Sunday). That is plenty of time to nail down concepts that are shaky and even those that have proven elusive. After all, if a duck (Australian, natch!) can learn to swear, then you can strive to learn more before your test and not be a “bloody fool!”.
https://www.washingtonpost.com/world/2021/09/07/australia-talking-duck-bloody-fool/

Perception in Test Prep?
Half of the success on the SAT or ACT is simply work. You have to do practice tests to work on stamina