Elementary mathematics refers to high school mathematics, and advanced mathematics refers to advanced mathematics, which I studied in university. In fact, the idea of learning mathematics is to do more problems, see more problems and focus on the foundation. I suggest you check carefully what are the requirements of self-taught accounting for mathematics? It's best to look at the questions in previous years, which will also help you have a direction in your study, buy some reference books and the like, and it's best to find a relative who has been to an undergraduate course or is studying. I hope everything goes well with you.