My family is very poor. My family will die

Hello madam,
My name is Pawani Dhamsa. I live in Ibbagamuwa, Sri Lanka. As you know, Cyclone Ditva hit Sri Lanka about 4 months ago. Many lives were lost. Among them were my mother and grandfather. I lost my father in an accident when I was young. I have a sister. Since the day my father passed away, my mother has taught me and my sister to live a good life without any shortcomings. I am appearing for the A/L exam this time. My sister is appearing for the O/L exam. That day, we stayed at our grandmother's house for safety. Since my mother had to go to work early in the morning, I got up at around 5 am and went to our house with my grandfather to get my mother's belongings. After a while, I heard that a mound of earth had collapsed on the place where our house used to be. After that, both my mother and grandfather went to my father's place. That memory is very painful. Even today, there is not a single piece of our house.  My sister, I and my grandmother are alone. My grandmother is also about 65 years old. She cooks for us. My sister and I don't have our birth certificates, national identity cards, books, etc. Everything is gone. My mother is running out of money now. Since my mother is gone, there is no one to stand up for us, so the government gave us a small amount as compensation. I got A8B1 for O/L. I was doing Maths for A/L. After my mother passed away, I didn't work hard at all. I had a hard time going to classes. I asked people I knew for money. My sister also stopped going to classes because she didn't have money. I help her as much as I can. I don't want to be a problem for anyone. My grandmother is sick right now. She feels so sad that she might die. But our mother wanted us to be in a good place with good character. She must be looking after us. I am asking for 4 more months. I don't even have money to go to classes. My grandmother doesn't even have money to buy medicine.  Can you please help me in any way you can? I would like to kindly request you to do so.