If you daughter reserves time for studies everyday and her scores are good then there is no need to worry. Do not pressurize her too much. Do not get angry at her. Remind her from time-to-time in soft tone that her exams are approaching. If she is not showing any interest in studies, get involved in her studies and take her revisions. But do not get over-involved and do not force her to do so. Tell her calmly that it is the time to study otherwise she will have to regret later on.