Cheating (on an exam) — dishonest behavior such as looking at another person's answers; often used as 'to cheat' (カンニングする).
試験でカンニングをしてはいけないと先生が言った。
The teacher said you must not cheat on the exam.
監督が厳しかったので、カンニングは難しかった。
Because the proctor was strict, cheating was difficult.
カンニングが発覚して退学になった学生もいる。
There are students who were expelled after their cheating was discovered.