In meetings for examination it is helpful to have a host that can see all attendees and interact with them. It is not required, and sometime it is forbidden, that attendees can see and ear each other. This will save also probably bandwidth.
Is it possibile to set a meeting where the host receives all video/audio connections from attendees and each attendee receives the video/audio connection from the host only. But where no attendee can have a video/audio connection with another attendee present in the meeting.