1. Understanding basic concepts: First, we must have a clear understanding of the basic concepts of sequence, including arithmetic progression, geometric progression, recurrence relation, etc. Mastering these basic concepts is the basis of learning sequence.

2. Mastering formulas and properties: The formula and properties of sequence are the key to solving problems. Master the general formula, summation formula and related properties of arithmetic progression and geometric progression, such as arithmetic progression's tolerance and geometric progression's common ratio.

3. Be good at using laws: There are often some laws in the series, such as the law of increase and decrease in arithmetic progression and the law of multiplication or decrease in geometric progression. We should be good at observing and discovering these laws and apply them flexibly to solving problems.

4. Do more exercises: consolidate what you have learned and improve your problem-solving ability through a large number of exercises. You can choose some classic problem sets or reference books to practice, and pay attention to summarizing the methods and skills of solving problems.

5. Pay attention to thinking methods: When solving the problem of sequence, we should pay attention to cultivating the ability of logical thinking and analyzing problems. By analyzing the characteristics of the purpose of the problem, we can choose appropriate ideas and methods to solve the problem, such as method of substitution and reverse thinking.

6. Do more mind mapping: Using mind mapping can help to sort out and sort out knowledge points and deepen the understanding and memory of sequence knowledge. You can display the related concepts, formulas, properties and other contents of the sequence in a graphical way to help you better understand and remember.

7. Reasonable arrangement of study time: Sequence is a relatively abstract and complicated mathematical concept, which requires a certain amount of time and energy to learn and understand. It is necessary to arrange the study time reasonably, adhere to a certain study time every day, and maintain the coherence and accumulation of study.

In a word, learning high school mathematical series requires mastering basic concepts, formulas and properties, being good at using laws, doing more problems, cultivating the ability of logical thinking and analyzing problems, and arranging learning time reasonably. Through constant practice and thinking, I believe I can get good grades.