1. Understand the basics: First, master the basic knowledge of primary school mathematics, including four operations, fractions, decimals, percentages, etc. This knowledge is the basis of follow-up study, so we should firmly grasp it.

2. Make a study plan: Make a reasonable study plan according to the examination content and requirements of junior high school mathematics. Break down the knowledge points into small modules, arrange a certain learning time every day or week, and complete it step by step.

3. Do more exercises: Mathematics is a subject that needs a lot of practice. By doing a lot of exercises, we can consolidate knowledge points and improve problem-solving ability. You can choose some math tutorials or online resources to practice.

4. Pay attention to thinking training: Mathematics is not only about memorizing and applying formulas, but more importantly, cultivating logical thinking and problem-solving ability. In the process of learning, we should pay attention to the methods of thinking and analyzing problems and cultivate our own mathematical thinking.

5. Ask for help: If you encounter difficulties or things you don't understand, you can ask teachers, classmates or parents for help. They can give you guidance and help you better understand and master mathematics knowledge.

6. Participate in more competitions and activities: Participating in some math competitions and activities can improve your math level and exercise your ability to solve problems and cope with exams. At the same time, you can also find your own shortcomings and further improve yourself through communication and comparison with other students.

In short, learning junior high school mathematics well requires unremitting efforts and continuous learning. By understanding the basic knowledge, making a study plan, doing more exercises, paying attention to thinking training, asking for help and participating in competitions, I believe you will definitely get good grades.