Introduction: Adolescence girls has been recognized as a turbulent period which signifies the transition from girlhood to womanhood and marked with the onset of “MENARCHE". The first menstruation is often traumatic to an premenarcheal girl because it usually occurs without her prior knowing about it. Therefore, health education program to prepare girls to face menarche by increasing their knowledge of menstruation and their readiness to face the menarche.

Objectives: To determine the effect of educational package on knowledge regarding preparation of menarche among girls in selected school of West Bengal.

Method: I conduct a one group pre-test post-test research design study among 60 school girls whose menstruation not yet started. A convenience sampling technique was adopted with structured knowledge questionnaire.

Result: There was significant relation between pre-test knowledge with education of mother (X2 5.83 p<0.05).

Conclusion: Present study reveals that knowledge regarding menarche being prepared physically and emotionally would lead to more positive attitudes and behaviors with respect to reproductive health.