Drastic measures, hard measures, more restrictive measures, strong measures

tough measures - drastic measures, hard measures, more restrictive measures, strong measures

poor discipline - bad discipline, ineffective discipline, lousy discipline, low discipline

behaviour – attitude, manner, comportment

anti social – unfriendly, unsociable, unsocial, uncommunicative, introverted

punishment – penalty, disciplining
tough – hard, difficult, rough, severe, heavy, toilsome

school – schooling, educational institutions