Isn't this an interpretation error rather than a drafting error.
"AMC1 FCL.215; FCL.235
THEORETICAL KNOWLEDGE EXAMINATION AND SKILL TEST FOR THE PPL
(a) Theoretical knowledge examination
(1) The examinations should comprise a total of 120 multiple-choice questions covering all the subjects"
So if we had one paper of 120 questions covering all the subjects. Then would not six sittings would seem perfectly appropriate?
Whereas we have 9 exams covering all the subjects but they still have to be passed in six sittings. Which obviously doesn't work so rather than admitting we have made a mistake we have defined a sittings as 10 days.
A crock it is