Describe the dining hall & classroom in To Sir, with Love.

In Chapter 3 of To Sir, With Love, Mr. Braithwaite
describes the "dining-hall-cum-gymnasium" as encompassing most of the ground floor of
the school.  At a table set apart from the rows of student tables the faculty sits. 
Sitting in groups of eight, the students are seated, with two of each group responsible
for collecting and distributing the food for their group. Braithwaite writes that both
boys and girls share this responsibility, displaying remarkable skill in portioning the
food.  At the end of each course, the servers stackthe dishes, and at the end of the
meal the tablecloths are shaken and folded, and then the group quietly awaits the
dismissal bell.

When the faculty is finished eating, Mr.
Florian rises and the students grow quiet. Signaling to them, the students leave the
dining hall quietly.  But, then, they assemble in the courtyard near the church where
they dance to swing music during the midday dance session.