1. Find out the problem: First of all, you need to find out where your math foundation is poor. Is it algebra, geometry, trigonometry or something else? Finding out the problem is the first step to solve it.
2. Make a study plan: Once problems are found, you can make a study plan. This plan should include what you want to learn every day or week and when you hope to reach your goal.
3. Use textbooks and reference books: Textbooks usually introduce concepts in a certain order, which is very helpful for understanding new concepts. Reference books can provide more in-depth explanations and more exercises.
4. Ask for help: If you have difficulty with a concept, don't hesitate to ask for help. You can ask teachers, classmates or parents for help, and you can also find relevant teaching videos and tutorials online.
5. Do exercises: Mathematics is a subject that needs a lot of exercises. By doing problems, you can better understand and master concepts, and at the same time improve the speed and accuracy of solving problems.
6. Keep a positive attitude: Finally, it is very important to keep a positive attitude. It may be difficult to learn math, but as long as you persist, you can certainly improve your math level.
Generally speaking, it takes time and energy to improve the math foundation in senior high school, but as long as you have determination and perseverance, you can certainly do it.