Relevant ICESCR Articles:

13(1): The States Parties to the present Covenant recognize the right of everyone to education . They agree that education shall be directed to the full development of the human personality and the sense of its dignity, and shall strengthen the respect for human rights and fundamental freedoms. They further agree that education shall enable all persons to participate effectively in a free society, promote understanding, tolerance and friendship among all nations and all racial, ethnic or religious groups, and further the activities of the United Nations for the maintenance of peace.

13(2)(d): Fundamental education shall be encouraged or intensified as far as possible for those persons who have not received or completed the whole period of their primary education;