Functions have many properties, such as parity, monotonicity, maximum of quadratic function, periodicity and so on. Every attribute is very important. All the topics are about the properties of functions, so it is very important to master the properties. The knowledge in the textbook of senior one is far from enough. Some properties and special functions must be accumulated by themselves, such as y=a/x+x, its monotonicity and images. Better teachers will mention this function. If you are a senior one, I suggest you borrow a math review material for students who graduated from senior three. These books sum up all the useful knowledge of high school mathematics. Although it is difficult, it will be very easy for you to understand these properties in senior one. When you review the whole research, you will have a feeling that other mountains are dwarfed under the sky ... your math level can be on a par with your math teacher. As long as you persist in this way for three years, I estimate that it is no problem for you to be admitted to a famous university in senior three. These things can't be explained clearly for a while, and what can be understood is only superficial. If you really understand these things, you think math problems are pediatrics for you, and math learning will not be stressful for you. You can focus more on other courses, hehe, I hope you can adopt them.