Important topics to study in order to increase ACT score?

I’ve taken the ACT a few times and my scores in the Reading and English are generally much, much higher than my scores in Math and Science. I’ve taken a class my school offers to help increase these scores but it seems as if I’ve hit a wall and cannot bring my Math score in particular up anymore. However, I need this higher score to be competitive for some colleges I’ve chosen to apply to. Is there anything that’s critical to know on the Math or Science portion that can assist in bringing my scores up?

The ACT isn’t conceptually hard. The problem is being fast enough to finish on time. I’d suggest not checking your work on the Math section until the second half of problems, as the first half is quite straightforward. Even then, check sparingly; otherwise, you will run out of time.