The teacher said the grades were not satisfactory. How should I reply?

The following are some expressions for replying to teachers with unsatisfactory grades, for reference only:

1, teacher, thank you for your evaluation of me. I know there is still a lot of room for improvement in my grades. I will study hard and try to do better in the next exam.

2. Teacher, you are right. My grades are really not ideal. I didn't give full play to my potential. I will reflect on my learning methods and attitudes, find out problems, strengthen my weaknesses and improve my grades.

Thank you for your criticism and guidance, teacher. I admit that my grades are not satisfactory. I will adjust my study plan, increase my review time, improve my study efficiency, and strive for progress in the next exam.