This behavior MOST closely fits covert non-destructive pattern of conduct disorder.
Covert non-destructive are indirect status offense and their behaviors are illegal due to the child's adolescent age. This type of action can be simply referred to the term "Truancy". It means that staying away from school without any proper reason.
It is an absence from mandatory education which is unauthorized and not justified. The students absence is in his own will which does not comes under any excused absences like medical conditions.