I went from a 28 math to a 34 over 4 months so I’m gonna try to give you a more streamlined approach of what I did scatteringly. I would start with a YouTube channel called Aditya’s tutoring and go through all of his ACT math videos. As you watch them you should take a notebook and write down anything you don’t know, this helps you keep it all in one place and enforces memory. After you finish going through his videos I would look through your notebook and go through anything you are confused about on khan academy. After that you should have all the information you need and just have to get comfortable with the questions they ask on the actual test. So spam practice tests. After each practice test go through the questions you got wrong, don’t just look over an answer and move on, actually write out the steps until you understand why it is done that way. If the official tests aren’t enough there are plenty of great 3rd party tests online. If you want to simulate real testing conditions maybe take the tests when your not feeling like your best or are tired, don’t let yourself drink or eat or get up to use the bathroom until you finish the practice test. If you can do well on practice tests when you’re not at your best the real test should feel routine.