Mathematics and physics are the basic subjects of modern advanced science and technology, and the contribution of chemistry to society and mankind is indelible. You said you wanted to make up lessons. You should have been exposed to these subjects in junior high school. Which subject is difficult for you to learn at ordinary times, and you'd better make up when you can't. As far as my personal learning experience is concerned, senior one chemistry is the foundation of senior three chemistry. To lay a good foundation, physics and mathematics in senior one are relatively simple. But by the second and third day of junior high school, it was the other way around. Physics and mathematics are more difficult. Chemistry was much easier at first. The more difficult physics is, the more gentle mathematics is. If you only pay attention to the first year of high school, it is recommended to supplement chemistry. If it is a long line, it is recommended to do math.