first of all, you should think about the reasons for your own decline in grades. If you have personal reasons, you should check and fill in the gaps. You should give yourself more encouragement. I believe you are great, but you haven't worked hard enough before. If you want to improve your grades, you need to do the following: 1. Adjust your mentality: you should overcome your careless conceit, abandon the burden-bearing psychology of "doing this at one stroke" and overcome your timid psychology. Learn to associate new knowledge with what you have learned and constantly improve your knowledge. This can promote understanding and deepen memory.

2 Organize memory: Listening should be combined with writing and thinking. Pure listening is easy to slack off and there are few points to remember, so you must learn to organize memory quickly. The knowledge points of some subjects need to be memorized. You can read books in the morning and evening and make full use of your time.

3 Review what you have learned before after class: Review it in time after reading, or you will soon forget what you have learned. It is necessary to master the basic knowledge in a planned way, and the knowledge points of each subject have their own characteristics, so as to master the knowledge points one by one. I still remember that in the third grade, my attention was often very bad, and I couldn't remember the words, which caused my grades to be very bad. It was not until I found an IQ-opening "Nikola Tesla Potential Course" on Baidu that I improved this bad situation. Great progress has been made in grades. I wish you smooth sailing and good luck.