Know who can't sit with whom and who comes from what environment. As a trainee, I can never have enough information that is so needed. A teacher who knows his students well knows exactly what and at what time of day he can expect from his students. He knows how to increase the productivity of his charges and what exactly applies to them. Only in this way can it achieve a good transfer of information.
A teacher who knows his students well knows exactly what and at what time of day he can expect from his students.