Repair shops usually aim at product profitability, mainly focusing on profitability, rather than training apprentices. Compared with regular schools, repair shop masters mainly consider completing their own work tasks instead of teaching students wholeheartedly. Therefore, "knowing how to do" does not mean "knowing how to teach". Many people who have been apprentices in repair shops for many years may not be able to operate independently.

In addition, there are many models in the garage, which may involve different car brands and models, making it difficult for apprentices to concentrate on improving a certain skill. In a 4S shop, it is usually only for one car series, so that apprentices can understand and learn more about the maintenance technology of this car series.

Regular schools have a systematic teaching mode, not only with modern hardware equipment, but also with professional lecturers. At the same time, standardizing the systematic teaching curriculum arrangement can fully ensure the learning effect. This is an advantage that no other training method can match.