I'm in grade six now. Why can't I do the exercises in the fifth grade math book at all?
Then you should practice and review more at ordinary times, or there will be no place for junior high school. You must be familiar with all the knowledge topics in primary schools, recite formulas and practice more. If not, you can ask the teacher, ask your classmates or ask me. As long as you can help, I can try my best to help you and lay a good foundation for your middle school.