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Is it really useful to break through high marks in junior high school?
Useful.

High Score Breakthrough in Junior High School Mathematics is a formal supplementary book. This textbook is written for junior high school exams. Through this textbook, students can break through the conventional knowledge practice.

Junior high school students brush questions: insist on it every day. If you are a math student, you must brush the questions every day. After finishing your homework, brush at least 3-5 questions every day according to your own arrangement. If they have time, they might as well brush a paper every day.