What to do if i'm close to my last pad and tampon and have no money. and my mother doesn't either what to do?

One thought: Most school nurses keep a supply of female sanitary materials for student use. I would encourage you to speak to your school nurse & explain your situation. Take care.

Alternates: It sounds like you are so broke that even paying for food might be a problem. You can make substitute pads out of paper toweling and cloth. Agencies like planned parenthood sometimes have sample tampons available for no cost. Other charitable agencies might also help.