It is undoubtedly true that many schools in the countries have faced a crucial problem that plagiarism. Although there are several factors. However, are also possible solutions.
About causations of plagiarism. The first thing that could concern is a lack of confidence. This often comes across to many students when someone who did not generally prepare or who has done well prepares, but unfortunately, misses the point of reflective studying. In these cases, the students would feel impatience and anxiety, and it could be a trigger to a lack of confidence. The second concern is family background. Some students, who were born in high educational families such as a doctor, lawyers, politicians so on. Those who might feel strong pressure. For instance, The parents would be disappointed if scores did not meet a level of satisfaction. Moreover, these are also relatively under pressure from peers who assume easily to achieve high scores by them, because they always do. Like this, the majority of factors are lack of confidence and under pressure from third parties.
However, there are several positive solutions. One thing is an approach from mental, which obtained self-control technique. For example, analyses itself, finds out when to be nervous and understands what actions to make comfortable during tight situations. Attain councillor is a good option as well.
The other thing is physically, increasing the number of examiners/invigilators, and installing CCTV during exams.
In conclusion, causations and solutions are varied. However, I believe the above leads to deferring plagiarism.