I think the method of doing the real questions of the college entrance examination upstairs is very useful for senior three students (just finished the college entrance examination, math 143, I hope it will help you), but you just entered the first year of high school and haven't finished class yet, so this method is not suitable.
As an experienced person, even from your point of view, I can assure you that high school mathematics is by no means the mathematics studied by the university mathematics department, but everyone can learn it well. As long as you get started, you will definitely gain by leaps and bounds if you continue to learn.
The following question is to give you some advice on how to get started:
I only have one suggestion, which is plagiarism. This copying means copying, textbooks, notes, examples and reference books can be copied. In fact, that's what I did, so I changed from 100 in senior three to 143. It can be said responsibly that I am not a case, and I am by no means a fluke. The reason for this is the following：
Personally, I think mathematics is recognized as the most difficult subject to learn because of its strong thinking. But this is not to say that everyone is not smart enough to learn math well, but because everyone is too lazy to think. But the unchanging truth is that you can't learn math well without thinking about it, and no one can take advantage of it. One of the characteristics of being unwilling to use your brain is that you are too lazy to write, thinking about the ideas, drafts and steps of solving problems. How can I learn math well? Copying is forcing you to write, and his thinking intensity is not strong. When copying, you only need to know what you are copying, and you don't need to think too much. This ensures that you won't resist. In the process of copying, you will naturally find something worth thinking about, and you will take the initiative to think. Slowly you will get into the habit of thinking and your hands will not be lazy. At this time, you will really get started. And your textbooks, notes and reference books, which you have studied carefully. Coupled with extra-curricular tutoring, the improvement of mathematics is by no means a problem.
Finally, I ended with a sentence from my senior (696 points in the college entrance examination): Don't despise plagiarism at any time. Many people call it mechanical labor and futility. In fact, the reason why it is reduced to mechanical labor is that the scribe himself is absent-minded in the process of copying, does not use his brain to understand, and remembers with his heart. For subjects with clear logic such as mathematics, you can also use symbols such as arrows and braces to express the implication relationship between concepts, so that the learning ideas of the whole unit are very clear. Then you can copy a few examples, and you must write them step by step to show the various specifications that should be used to solve this kind of problem. Finally, you can copy a few representative topics you see in reference books. All kinds of notes are marked with red pen, and the important and error-prone places are drawn directly with wavy lines. ......
In short, everything needs to be innovated and explored by ourselves. You can't understand the mystery of plagiarism without trying.