How to deal with heavy periods at school?

Normal?: I'll answer assuming you have seen your Doctor to determine there are no reasons like fibroids or other medical condition causing heavy bleeding and you have been checked for anemia. My advise is to Be prepared. Bring plenty of spare pads, tampons and undies, wear black pants. I have had patients tell me they wear depends on their heaviest days. You may want to look into getting a uterine ablation

Hormonal Supression: If your periods are too painful/heavy, see a GYN and get an US to detect problems like cervical lesions, infections, polyps, or fibroids. If you don't have any of these, you may benefit from hormonal control using contraceptives like the pill/patch/ring. The best option is a hormonal IUD (Mirena), that thins the lining and decreases your flow significantly. Some women even stop having periods!