My dear . Training programs during the service should include training teachers to adopt teaching methods that help students to develop knowledge and motivate them to learn
The science of teacher training, pedagogy, should answer all the questions that are required for this profession.
Unfortunately, Western higher education is so politically dogmatic and mystical that the training of teachers is deeply misguided.
The top level of current knowledge is systemic philosophy. Consequently, pedagogy and educational management should be based on the results of fundamental sciences (mother tongue, mathematics, physics, chemistry, biology and their deepening) synthesized in a new pedagogy, Systemic Pedagogy.
The synthesis of the paper to be published soon, can be accessed here: https://www.academia.edu/38067783/Presentation_The_Systemic_Pedagogy_and_the_Performance_of_the_Future_Education