Don't be discouraged. It seems that my total grade in the first grade of primary school is only 120, that is, I just passed, and I am still in the first grade, but the third grade has become one of the best in my class. The method of mathematics is to look at the example analysis and do it after reading it. I did something wrong. I'm watching. Until you understand.

I wish you progress in your studies.

I am glad to answer your questions and hope to adopt them.