Mathematics is the main subject, accounting for a relatively high proportion, and junior high school mathematics is relatively simple. Listening carefully, reviewing hard and practicing more are enough, so this course can't be abandoned. When you are admitted to the senior high school entrance examination, the first thing is to ask the culture to cross the line. When your grades are not high, and the art has crossed the line to ensure admission.
Junior high school art is easy to cross the line, and it doesn't take too much time to train. You should spend more time studying culture, especially math and English. These two subjects are easy to score. If you fall behind in these two subjects, you will only widen the gap with others.
Mathematics is a subject with great development space. If you have a poor foundation in mathematics, please consult the better students in your class, and I believe they will teach you patiently, or you can consult a teacher, or you can ask a tutor to make up this subject if you have the conditions. Work hard, I believe you can handle it, come on!