Hello, you just finished reading the calculus foundation of senior one. It's really not easy. Calculus is very helpful for you to understand the nature of derivatives. You will probably come into contact with the series limit in the derivative of one variable and the continuous high number of the function in the third year of high school. The continuity and uniform continuity of Cauchy convergence criterion of function limit are very helpful for the continuity of your learning function in senior three, provided that you can accept that kind of mathematical thinking. Advanced mathematics is not closely related to high school mathematics. From the beginning, it is to let you accept an extreme thinking. L'H?pital's law of derivative works well for the infinite to infinite to zero type in high school derivative. As far as I understand it at present, the others should be of little help and more quantity. Some concepts need to be tried and tried again to understand. Self-study under the guidance of the teacher may make you form an inappropriate understanding in advance, so it is enough to master integral calculus. After all, high school should focus on the college entrance examination. I hope you can keep your interest in mathematics and keep working hard.