The absenteeism-related behaviour in which children willingly make themselves absent from the classroom activities of the school without the prior permission of their parents is called

Truancy is the absenteeism behaviour in which children willingly stay away from school's classroom activities without their parents' prior permission.

It is deliberate, unauthorised absence rather than an accidental one.

Cheating is dishonest conduct to gain unfair advantage in tests or work.

Tantrums are outbursts of anger or frustration, usually in young children.

Lying is the deliberate telling of untruths.

Truancy is treated as a behavioural problem linked to disengagement and irregular attendance.