Yes, but you must listen carefully and do the questions. You can't give up halfway. Junior high school mathematics and senior high school mathematics are definitely related, but teachers usually mention previous knowledge when they talk about topics, so you should listen carefully and do more questions. If you find that you can't, you must ask, so that you can make progress. When I was in high school, I was poor at math at first. 150 I only got over 30 points and over 50 points. In the third year of high school, I changed my teacher. He just grasped the foundation and reviewed all the books in high school for us. Later, I often scored more than 100 in mathematics, with the highest score of 126. Let's go Haha's laughter ...