I don't think the relationship between junior high school mathematics and senior high school mathematics is particularly great, but it is definitely impossible without junior high school mathematics as the foundation. I am telling you this responsibly. Some high school things must be accepted on the basis of the thinking system and knowledge system established in junior high school. Without a foundation, it is difficult to move forward. Really, my friend, I really suggest you make up junior high school math. I suggest you find a good one-on-one teacher and spend a holiday learning junior high school knowledge from the perspective of high school. The so-called high school perspective is to divide the content of high school into junior high school chapters according to categories. In addition, math skills, I think my only skill is the feeling of the problem, I have mastered the knowledge, I have done everything thoroughly, I don't want to be too much, I refined it, and then my feeling will come up slowly. As for memorizing formulas, that's a prerequisite, not a skill. If I want to learn math well, I think I should think everything clearly as much as possible in my life. This is just my personal opinion. I hope I can help you. I wish you a happy struggle!