Math exam every wednesday

There is a weekly math exam on Wednesdays. The teacher some time allows me to leave school or change room, (from 3:20pm to 5:20pm)
The exam takes place is the classroom, students remain seated in the usual way, and the "monitor" (equivalent of head boy, "délégué") takes the teachers table on the stage. The teacher can leave the classroom without a shadow of a doubt any student would dear to cheat!!!
It is considered a shame to cheat here. I am sitting a the back of the classroom; smiling; just picturing what French student would make of this juicy opportunity... !