You can delay your period in advance with medication or take painkillers. Generally speaking, if the time of menstruation is exactly during the college entrance examination, then you can start taking oral progesterone capsules or intramuscular progesterone 2 weeks in advance to delay the onset of menstruation. However, it should be noted that the oral medication needs to be taken in advance to avoid failure to delay menstruation. If you are already approaching the time of menstruation, and you usually have menstrual cramps or heavy periods, you can take oral pain medication, such as ibuprofen or acetaminophen, to help with the pain during your menstrual period. It is advisable to consult your doctor for advice before using the medication, and to take treatment as prescribed by your doctor, rather than using the medication on your own.