@Marlin Salehma Rishab has a video about this too, but personally I strongly recommend taking practice tests and making a Google Sheet or using another method to keep track of your previous mistakes. Make sure you know exactly why your answer is incorrect, why the correct answer is correct, and why the other answer choices are also incorrect. This helped me a lot when preparing for the ACT to make sure I didn't make the same mistake multiple times. I hope this helps!

@Blake Davis Thank you so much!

If you've taken algebra 2, I recommend taking it in 10th grade because normally junior year is busier, so it's better to study for it while you don't have that much homework yet. Also, it gives you some more time to retake it or switch to ACT if needed. But I recommend taking a diagnostic first to see where you're at and then go from there.

Honestly just googling and looking at YouTube videos helped me a lot. There's a ton of good videos out there (ie. Khan Academy) that explain everything with really good graphics, so I found those really helpful when I took physics.

You can go to rishabacademy.com/act-free and click on "send over my free ACT guide". It takes you to a billing page but you just have to enter your email address- no credit card info needed. Hope this helps!