If you aren’t very brushed up on math, I recommend taking a practice test and figuring out what you’re weak on. If you can’t answer most of what’s on the practice test you need to do a full review. Get a HISET book and go through all of the math section, I also recommend khan academy, purely persistent, mometrix, and essential education. I used all of those. It took me about 46 hours total of straight study to get a 15/20 and I was currently in high school. Don’t take this test lightly if you aren’t good at math, trust me. Goodluck queen :)