Then it must be from the teacher's handout and learning effect.
Teachers in Chinese public education are experienced and can only attend classes after layers of selection and assessment. And even if you attend classes, you will be assessed in stages, continue your studies, and constantly update and improve yourself before giving classes to students. And the most important thing is that the teachers' academic qualifications are all graduate students or above.
The handouts are also rich, and the teachers and R&D team are very professional.
In the process of learning, different teachers will classify and urge you to learn at different stages. It is a good study under the condition of poor self-control. Since you choose training, you can believe in Chinese public education.