Help a young guy finish his engineering

Hello, my name is Enrique Esquer, I'm 21 years old and I'm studying an engineering in electronics for 4 year now. I am from Mexico, and things are very hard here, my family is deep in debt and I wish I could help them, school is relatively expensive here.

When I started to study the engineering I thought it would be great, and it was until we had to buy our work instruments, my parents didn't have money to spare at all, only money for buses, so I could never buy any of the equipment I needed and wanted. Even with this situation my grades were almost perfect.

I decided to look for a job as an English teacher to get some money. I had learned the language since I was almost 15, I worked every day, I went to work in the mornings and to school in the afternoons, I left home everyday at 7 a.m. and came back at almost 9 p.m. from Monday through Friday, even worked the whole Saturday and half a day on Sundays. This went on for 2 years, and as time passed I noticed my grades going downhill and it was no surprise, I had no time to study nor do any homework, I barely could see my girlfriend from time to time and got like 4-5 hours of sleep on a daily basis, I felt terrible, even If I worked as an English teacher jobs here in Mexico don't pay much, and barely could pay for school but it was something less to worry for my parents.

At this time I thought that it was time to make a choice, either continue working and risking my grades and subjects or quit. I went for the second choice because I didn't want to flunk, my parents still had no money to pay for my tuition so they asked for loans and loans, debts that to this day they still are paying and still keep on asking for more loans for me and my younger sister and brother.

Now I'm supposed to graduate in half a year, but since I am deep on debt with school they won't give me my degree and still have to pay for graduation. I don't know what to do, I don't want to quit school, but my parents don't have any money, I've been working with my father on weekends ever since I quit as a teacher and saving up some money but that is nothing compared to what I owe in my university, and still I have to pay for monthly fees and every six months.