Buy a basic book, a new observation, an exercise, an original and innovative class, any one with an answer. Practice by yourself, and ask the teacher if the answer is wrong. Remember the definition of blue and bold in math books. If you have perseverance, you really can't sign up for remedial classes. Teachers should be patient and responsible. The first volume of seventh grade mathematics is mainly calculation and practice by yourself. Write down the wrong knowledge points during this period every day, and try not to make mistakes next time.