Examinations can be conducted at called meetings:
Art. 436. (473). [FONT=NewCenturySchlbk,NewCenturySchlbk][FONT=NewCenturySchlbk,NewCenturySchlbk][FONT=NewCenturySchlbk,NewCenturySchlbk]Examination: How Conducted. [/FONT][/FONT][/FONT]A candidate may be examined as to his proficiency at a stated or called meeting after receiving the Entered Apprentice or Fellowcraft Degree.
The examination must be conducted only in the Lodgeroom with the Lodge opened in the degree for which the examination is being given.
The Entered Apprentice examination may be conducted in one section of the proficiency examination at a time, and each section can be balloted on separately after it is conducted.
As far as mutiple candidates turning in at the same time, I can't find it in GL Law but our lodge at the WM discretion will allow 2 candidates to turn in at the same time taking alternate questions, during the obligation at the examiners direction one will start and the other will complete.