No matter which part of the examination room, no matter which time period, there should be a predetermined time and rhythm.
For example, the data analysis question 15 is prepared 20 minutes in advance, regardless of whether it is done first or later, it is done according to this time.
Of course, it is impossible to complete all the topics within the specified time, so you need to choose simple ones.
For example, if you find that you can't finish 15 in 20 minutes, then do 12.
These should be active arrangements and choices, rather than passive "arrangements" in the examination room, which will make people panic.