4.
S1: The examination system must be regarded as the chief wrecker of young nerves.
S6: If I become a Vice-Chancellor, my first act would be to abolish all examinations in my university.
P: It makes me jump out of the bed, all in a sweat.
Q: It does this by building up a tension, for a part of the year, all through one’s youth.
R: And after four decades, the same nervousness sometimes recurs to me in nightmares.
S: I remember the desperate nervousness that used to grip me from January to April every year.
The correct sequence should be