Preview before class is like a wonderful trip. At the beginning of the trip, I was a little worried and hesitant, worried about the unknown world I would face next. However, the unknown always gives people endless attraction. I made up my mind to complete this adventure with my wisdom and perseverance like a warrior. In the process of previewing, I encountered some troubles, but I remained patient and calm, and finally gained a lot of interesting knowledge by using my intelligence and wisdom, and experienced the fun brought by mathematics. Different from passive learning, the knowledge gained by active exploration not only impressed me more, but also cultivated my self-study ability. I think, in the future study life, self-study ability will be my most important asset. Preview has given me a lot, improved my ability, improved my quality, and made me more confident to face the future study. At the same time, in the process of preparation, I also found some problems that I can't solve. I will write these questions down and discuss them with my teachers and classmates after school. I believe it will be very interesting. Preview made me see my own shortcomings and kept me modest and enterprising. In short, the benefits of preview are numerous, and I must adhere to the good habit of preview before class.