Psychiatrists and psychologists advise parents to avoid stressing out their Primary 6 children as they prepare for the Primary School Leaving Examination.
One boy who was under pressure for a year eventually broke down and became hysterical.
A parent said she realised she had pushed her son too far when he refused to go to school.
Experts said children under stress may complain of unexplained insomnia, stomachaches and headaches.
In more extreme cases, it could drive children to cutting and scratching themselves.