Some of my students are not interested in mathematics. I found that most children don't really want to learn math well, but because of various factors, the math foundation is weak, they can't keep up with the teacher's ideas in class, and they don't know how to learn math efficiently after class, which leads to a vicious circle. So that I finally lost confidence in mathematics.
Therefore, if such students want to learn mathematics well, they must first regain their confidence. Usually, I will tell such students that as long as you can read all the textbooks several times and practice the questions at the back of the book, it will be easy for you to get 90% of the math test (whether in junior high school or senior high school).
If you have a strong sense, I suggest you start with the most basic math book (compulsory for senior high school and junior high school 1) and read one word at a time (no more than one word, no less than one word, if the sentence is too long to read, it can be divided into several small paragraphs for understanding). Every example is the key, and we must understand how each step in the example came about. Every example should be done on paper by yourself, always the same as the steps in the book (if it is high school, it is even more detailed than the book, it is best to write out the process omitted in the book), and then do the questions after the book (junior high school can do all A-level questions first, high school can do all A-level questions first, most B-level questions, and the last two or three B-level questions can be put aside first).
Your problem lies in the weak foundation, but on the one hand, you can't understand what the weak place is, so the teachers and family members of the school can't give the most efficient learning plan for your problem. Your brother may be good at science, but that's different from teaching others, so it's not that you can't learn math well, but that you haven't found a suitable learning method for you.
Only self-study is the most efficient learning method. Because only by knowing what you can't do can you solve the problems you can't do in the fastest and shortest way, or unless you can meet a patient teacher who has a strong understanding of all scientific education.
Of course, it is not easy to learn to read by yourself, but is it difficult to learn math well? At least the words in the book are Chinese characters, and they can still be understood. If you don't understand, you can take pictures and ask me. Although I usually have a lot of classes, I have time to come up every night after 10 recently.
Btw: There are five foundations for learning (and five foundations for success). If you are not interested and don't have time to cultivate your interest, you should have a correct attitude and don't give up easily. With a correct learning attitude, we must improve our study habits and methods. Reading textbooks mentioned above is the most basic, thorough and efficient learning method.
Finally, I wish you success in your studies!