It is not uncommon for people to improve their grades through cram schools, but the effect is not obvious. However, most students who have taken extra-curricular classes will improve their grades. Why can't some students improve their grades in cram schools? I think there are several reasons.

First, parents' expectations are too high, and the improvement of their grades has not reached their expectations.

Some parents enroll their children in cram schools in order to make rapid progress. I just want to get immediate results after a short tutorial. I have never thought about my children's roots, nor have I learned about their detailed study. They think that if I pay for the cram school, you have to improve my children's grades. Never think about the children's detailed performance in the cram school and the teacher's contribution to the children. Just seeing that the children's grades have not improved at all during the exam, blame the cram school teacher for not giving lectures. This is that parents expect too much from their children and too much from cram school teachers. So I feel that the effect of cram school is not obvious.

Second, students' learning foundation is too poor, and there are problems in their study habits and learning methods and skills.

For most students who go to cram schools, the foundation is not too thin. Students with excellent grades rarely go to cram schools to stop cramming. The only way to stop cramming is to stop stretching their knowledge. For many students with poor learning foundation, there are still some bad study habits, and there are many problems in learning methods and skills. However, tutoring in cram schools is only a single learning knowledge, and some study habit tutors are rarely mentioned.

Third, students are forced by their parents to make up lessons outside school just to cope with running errands.

Nowadays, many students have various cram schools every day from Monday to Sunday, and some students even apply for several cram schools for one subject, which makes many students have to go back and forth between cram schools every day besides studying at school, and students have no comfort. And parents force students to attend so many cram schools.

In order to really improve students' grades, parents need to stop guiding and guiding students from study habits, methods and attitudes. As long as this can stimulate children's enthusiasm for learning and improve students' interest in learning, then the progress of learning is a natural thing.