Insufficient primary education

Lack of preparatory education
Denial of right to free primary education
It seems unlikely that the majority of developing countries will be able to introduce universal primary education, much less adequate primary education, in the foreseeable future. Worldwide, but especially in developing countries, millions of children who are in principle able to enrol in primary school nonetheless receive an incomplete basic education, due to the necessity of travelling long distances to school, of working at home, the inability to pay, or the lack of either motivation or materials.
Half the children in the developing countries today do not receive a full cycle of primary education.
Aggravated by 
(D) Detailed problems