<p>The study guides on Amazon seem to be practice tests - does anyone know if there is a source to study for the material itself? </p>
<p>I'm an adult and I'd like to take the ACT but naturally, I've been out of high school for so long that I don't remember much of the material that I learned. The ACT website lists the categories but a source to brush up on trig, geometry, etc. would be helpful. </p>
<p>Thanks </p>