When the written review was instigated, 1959 I think, you filled in the answers and after 30 minutes handed your paper in to the TMS Servant. He marked the paper and returned it the following week. Each of the 25 questions were worth a maximum of 4 points so you ended up with a percentage. I noted on the example you provided someone had faintly entered "4" in the answer part.
the TMS Servant would announce the average percentage and the maximum grade (no names of course) and review a few of the questions that caused the most problems.
Exchanging your paper with someone else or marking your own paper came much later.
A role call was made at the start of the meeting but only for those who were in the Ministry School.
JW's would have a fit if they had to do that today!
George