ACT Tips and Advice Post
And hey, while we're at it, let's try for a full list of EVERY math formula and concept that shows up on the ACT (see below). If you feel that I've left anything out, then please let me know at firstname.lastname@example.org.
That being said, the fewer formulas you need to remember, the more you can focus on technique, and good technique is the true key to an excellent ACT score. I don’t teach my students unnecessary formulas because I can teach them to find the answers using a more logical approach to the problem.
For more information you can read my ACT Action Plan.