There are still many students living in remote areas where it is difficult to reach them or ask them to go to the school due to lack of adequate transportation system or schools. In some places, number of students is so small so that it will be very expensive to build a school building to serve their needs. On the other hand teacher: students ratio usually bigger in urban areas in compare to the remote ones. It is not unusual to see 60 or even more students in a class with one teacher in some of the countries.