E/C.12/KEN/CO/2-5 It also recommends that the State party bring the Registration Guidelines for Alternative Provision of Basic Education and Training in line with articles 13 and 14 of the Covenant and other relevant international standards; that it ensure that all schools, public, private, formal or non-formal, are registered; and that it monitor their compliance with the Guidelines. 59. While noting the measures taken to assist children who have left school to continue to study, the Committee reiterates its concern at the large number of children dropping out of school, particularly girls due to early marriage and pregnancy (arts. 13 and 14). 60. The Committee recommends that the State party take the measures necessary to address the underlying reasons why children drop out of school, to intensify its efforts to prevent students from doing so and to bring those children back to school to complete their education. Access to the Internet 61. While noting that more than 50 per cent of the population has access to the Internet, the Committee expresses its concern that, among disadvantaged and marginalized individuals and groups and in rural areas, such access is limited (art. 15). 62. The Committee recommends that the State party continue working to expand Internet access, in particular for disadvantaged and marginalized individuals and groups. D. Other recommendations 63. The Committee encourages the State party to ratify the Optional Protocol to the International Covenant on Economic, Social and Cultural Rights. 64. The Committee also encourages the State party to withdraw its reservation to article 10 (2) of the Covenant. 65. The Committee recommends that the State party take steps to progressively develop and apply appropriate indicators on the implementation of economic, social and cultural rights in order to facilitate the assessment of progress achieved by the State party in the compliance of its obligations under the Covenant for various segments of the population. In this context, the Committee refers the State party to, inter alia, the conceptual and methodological framework on human rights indicators developed by the Office of the United Nations High Commissioner on Human Rights (HRI/MC/2008/3). 66. The Committee requests the State party to disseminate the present concluding observations widely among all levels of society, particularly among members of Parliament, public officials and judicial authorities, and to inform the Committee, in its next periodic report, about the steps taken to implement the recommendations contained herein. It also encourages the State party to engage non-governmental organizations and the wider civil society in the implementation of the present recommendations, as well as in the preparation of its next periodic report. 67. The Committee requests the State party to submit its sixth periodic report, to be prepared in accordance with the reporting guidelines adopted by the Committee in 2008 (see E/C.12/2008/2), by 31 March 2021. The Committee also invites the State party to update its common core document in accordance with the harmonized guidelines on reporting under the international human rights treaties (see HRI/GEN/2/Rev.6, chap. I). 10