Every course of studying abroad in American high schools is divided into four grades: academic, honor, AP preparatory course, AP, and the difficulty of AP is increasing in turn. As long as the content is everything in our high school, they also learn. It's just that they divide mathematics into several plates, trigonometric function, algebra 1, algebra 2, geometry 1, geometry 2, trigonometric function and preparatory calculus. If you choose AP course, you must study calculus in university and take the exam at the end of the year. If you pass, you can get college credits. Of course, this is more difficult. If it is academic and honor, it is equivalent to the difficulty of our junior high school. The level before AP is similar to that of our high school, which may be a little simpler, but the content of AP course is not available in our high school, so we should learn it thoroughly.