1. Grasp the basics: ensure a clear understanding of basic concepts and formulas. High school mathematics is based on previous knowledge, so make sure that you have mastered the mathematical concepts of previous grades.

2. Make a study plan: Make a reasonable study plan, break down each topic into small study tasks, and arrange time for completion. This helps to maintain the coherence and organization of learning.

3. Do more exercises: Mathematics is a subject that needs to be practiced. Consolidate the concepts and skills you have learned by doing more exercises. Try to solve various types of problems, including multiple-choice questions, fill-in-the-blank questions and solution questions.

4. Pay attention to understanding rather than memory: Mathematics is a subject based on logical reasoning and understanding. Don't memorize formulas and theorems just to cope with exams. Try to understand the principle behind each concept so that you can apply it better.

5. Ask for help: If you encounter difficulties on a topic, don't be afraid to ask for help. You can consult a teacher, attend a remedial class or study with your classmates. Discussing and answering questions with each other is helpful to deepen understanding and improve learning effect.

6. Pay attention to thinking training: Mathematics is not only about calculating and applying formulas, but also needs to cultivate good thinking habits and problem-solving ability. Do more thinking training questions, such as math competition questions, to improve problem-solving ability and logical thinking.

7. Use technical tools: Using some online learning tools and technologies can help you better understand and master math knowledge. For example, you can use a calculator to calculate numbers and watch teaching videos on the online education platform.

8. Keep a positive attitude: Mathematics may be a challenging subject, but it is very important to keep a positive attitude. Believe in your ability, believe that your efforts will pay off, and always remind yourself why you like mathematics and the benefits of learning it well.

These methods and skills are based on personal learning experience and the advice of educational experts. According to your own situation and needs, choose suitable learning methods and strategies, continue to work hard and persist in learning. I believe you will get good grades in high school math study!