My grades in primary school and junior high school were ok, but I felt particularly hard after I went to high school. Comparing the learning difficulty between junior high school and senior high school, I personally think it is really a steep rise in difficulty.
Mathematics is the basic operation method and theory in primary and junior high schools. Chinese is the study of basic knowledge such as words, sentences and writing. English is a simple everyday language for students, and the most difficult thing is a relatively simple essay. Other subjects, including physics, chemistry, biology, geography and history, mainly focus on the study of basic knowledge. As long as children are serious and keep up with the teacher's teaching rhythm, they will generally learn well.
After high school, mathematics begins to learn complex mathematical theories, which requires strong logical thinking and spatial imagination. Mathematical operations have also become complicated. I remember when I was in high school, I failed math in the first half of my senior year. The transition from basic mathematical theory to complex mathematical theory needs to think about the change of mode. They are two different ways of thinking and different angles of thinking. Without this transformation of thinking angle, deep learning cannot be completed. I remember that I had a hard time understanding the original mathematics.
Physics in senior high school is not the same as that in junior high school. I remember that I won the third prize in physics in junior high school, but physics in senior high school always gave me a headache. I seem to be in the middle of it and I can't find my way. It can be said that I have never broken through the method of physics learning, and I can only do some simple calculations.
Chemistry and biology in senior high school are ok, but the content has increased and the difficulty has not increased much. English vocabulary requires more, and the difficulty of reading comprehension and cloze has increased. You not only read it, but also understand it. Other subjects have increased a lot in content, but the difficulty is ok.
In short, the learning difficulty and learning volume of senior three have increased. You can't learn by being earnest and practical. First of all, we must complete the transformation of thinking mode. This is my little experience, I hope it can help you.