1, review and summarize the basic knowledge: function is a basic concept in mathematics, which ensures a clear understanding of the definition, nature and basic operation of function. Review related formulas and theorems, such as the image, properties and inverse function of functions.

2, brush questions and exercises: deepen the understanding of the function through a lot of exercises. Choose some topics with different difficulties and gradually improve the ability to solve problems. You can find related exercises from textbooks, workbooks or online math learning platforms.

3. Ask for help: When you encounter problems or concepts you don't understand, you can ask teachers, classmates or math counselors for help.