| # | Flag | Country | Pupil-teacher ratio, upper secondaryPupil-teacher ratio, upper secondary | Year |
|---|---|---|---|---|
| 1 | Papua New Guinea | 83 | 2016 | |
| 2 | Ethiopia | 43 | 2015 | |
| 3 | Mozambique | 36 | 2013 | |
| 4 | Malawi | 35 | 1997 | |
| 5 | Nicaragua | 34 | 2010 | |
| 6 | Eritrea | 31 | 2017 | |
| 7 | Bangladesh | 31 | 2017 | |
| 8 | Vanuatu | 31 | 2015 | |
| 9 | Thailand | 31 | 2015 | |
| 10 | Afghanistan | 30 | 2015 | |
| 11 | India | 30 | 2016 | |
| 12 | Pakistan | 28 | 2017 | |
| 13 | Sierra Leone | 27 | 2017 | |
| 14 | Vietnam | 27 | 1998 | |
| 15 | Kenya | 26 | 2009 | |
| 16 | Guinea | 26 | 2011 | |
| 17 | Liechtenstein | 26 | 2016 | |
| 18 | East Timor | 26 | 2017 | |
| 19 | El Salvador | 26 | 2017 | |
| 20 | São Tomé and Príncipe | 26 | 2016 | |
| 21 | Senegal | 25 | 2004 | |
| 22 | Colombia | 25 | 2017 | |
| 23 | Cambodia | 25 | 2007 | |
| 24 | Yemen | 24 | 2013 | |
| 25 | Nepal | 24 | 2017 | |
| 26 | Philippines | 23 | 2016 | |
| 27 | Ghana | 23 | 2018 | |
| 28 | Burkina Faso | 23 | 2017 | |
| 29 | Nauru | 22 | 2016 | |
| 30 | Angola | 22 | 2016 | |
| 31 | Dominican Republic | 22 | 2015 | |
| 32 | Solomon Islands | 22 | 2010 | |
| 33 | Guyana | 21 | 2012 | |
| 34 | Peru | 21 | 1999 | |
| 35 | Djibouti | 21 | 2018 | |
| 36 | Myanmar | 21 | 2017 | |
| 37 | Laos | 20 | 2017 | |
| 38 | Ivory Coast | 20 | 1999 | |
| 39 | Namibia | 20 | 1999 | |
| 40 | Ecuador | 20 | 2016 | |
| 41 | Kiribati | 19 | 2008 | |
| 42 | Bolivia | 19 | 1999 | |
| 43 | Turkey | 19 | 2015 | |
| 44 | Mongolia | 19 | 2006 | |
| 45 | Jamaica | 19 | 2002 | |
| 46 | Madagascar | 18 | 2017 | |
| 47 | United Kingdom | 18 | 2016 | |
| 48 | Chile | 18 | 2017 | |
| 49 | Iraq | 18 | 2004 | |
| 50 | Niger | 18 | 2017 | |
| 51 | Finland | 17 | 2016 | |
| 52 | Samoa | 17 | 2016 | |
| 53 | Uruguay | 17 | 2010 | |
| 54 | Chad | 17 | 2016 | |
| 55 | Paraguay | 17 | 2012 | |
| 56 | Sri Lanka | 17 | 2017 | |
| 57 | Liberia | 17 | 2016 | |
| 58 | Nigeria | 17 | 2010 | |
| 59 | Malaysia | 17 | 2004 | |
| 60 | Republic of the Congo | 16 | 2012 | |
| 61 | Rwanda | 16 | 2017 | |
| 62 | Algeria | 16 | 1997 | |
| 63 | Iran | 16 | 2017 | |
| 64 | Morocco | 16 | 2017 | |
| 65 | Togo | 16 | 2011 | |
| 66 | Burundi | 16 | 2017 | |
| 67 | Brazil | 15 | 2016 | |
| 68 | Slovenia | 15 | 2016 | |
| 69 | Netherlands | 15 | 2016 | |
| 70 | Mauritania | 15 | 2016 | |
| 71 | Cape Verde | 15 | 2017 | |
| 72 | Barbados | 15 | 2017 | |
| 73 | Belize | 15 | 2017 | |
| 74 | South Sudan | 15 | 2015 | |
| 75 | North Korea | 15 | 2018 | |
| 76 | Saint Vincent and the Grenadines | 15 | 2010 | |
| 77 | Indonesia | 15 | 2017 | |
| 78 | Puerto Rico | 15 | 2016 | |
| 79 | Equatorial Guinea | 14 | 2000 | |
| 80 | Honduras | 14 | 2017 | |
| 81 | Palau | 14 | 2000 | |
| 82 | Albania | 14 | 2017 | |
| 83 | Germany | 14 | 2016 | |
| 84 | China | 14 | 2017 | |
| 85 | Tonga | 14 | 2015 | |
| 86 | Panama | 14 | 2016 | |
| 87 | United States | 14 | 2015 | |
| 88 | Uzbekistan | 14 | 2017 | |
| 89 | Montenegro | 14 | 2017 | |
| 90 | Sweden | 14 | 2016 | |
| 91 | Sudan | 14 | 2017 | |
| 92 | Seychelles | 14 | 1999 | |
| 93 | Antigua and Barbuda | 13 | 2012 | |
| 94 | Andorra | 13 | 2005 | |
| 95 | Romania | 13 | 2016 | |
| 96 | Egypt | 13 | 2017 | |
| 97 | Mali | 13 | 2017 | |
| 98 | South Korea | 13 | 2016 | |
| 99 | Mexico | 13 | 2017 | |
| 100 | Fiji | 13 | 2012 | |
| 101 | Cameroon | 13 | 2016 | |
| 102 | Marshall Islands | 12 | 2009 | |
| 103 | Bulgaria | 12 | 2016 | |
| 104 | Costa Rica | 12 | 2016 | |
| 105 | Denmark | 12 | 2014 | |
| 106 | Iceland | 12 | 2012 | |
| 107 | New Zealand | 12 | 2017 | |
| 108 | Swaziland | 12 | 2003 | |
| 109 | Austria | 11 | 2017 | |
| 110 | Tunisia | 11 | 2010 | |
| 111 | Switzerland | 11 | 2016 | |
| 112 | Saint Lucia | 11 | 2017 | |
| 113 | Czech Republic | 11 | 2013 | |
| 114 | Spain | 11 | 2016 | |
| 115 | Republic of Macedonia | 11 | 2015 | |
| 116 | Slovakia | 11 | 2015 | |
| 117 | France | 11 | 2013 | |
| 118 | Grenada | 11 | 2017 | |
| 119 | Saudi Arabia | 11 | 2014 | |
| 120 | Bosnia and Herzegovina | 10 | 2017 | |
| 121 | Japan | 10 | 2016 | |
| 122 | Hungary | 10 | 2016 | |
| 123 | The Bahamas | 10 | 2016 | |
| 124 | Guinea-Bissau | 10 | 2000 | |
| 125 | Cayman Islands | 10 | 2018 | |
| 126 | Moldova | 10 | 2017 | |
| 127 | Singapore | 10 | 1996 | |
| 128 | Cyprus | 10 | 2015 | |
| 129 | Macao | 9 | 2017 | |
| 130 | Oman | 9 | 2017 | |
| 131 | Poland | 9 | 2016 | |
| 132 | Italy | 9 | 2016 | |
| 133 | Portugal | 9 | 2016 | |
| 134 | Qatar | 9 | 2017 | |
| 135 | Greece | 9 | 2016 | |
| 136 | Turks And Caicos Islands | 9 | 1999 | |
| 137 | Cuba | 9 | 2017 | |
| 138 | Bahrain | 9 | 2017 | |
| 139 | Belgium | 9 | 2016 | |
| 140 | Maldives | 8 | 2003 | |
| 141 | Jordan | 8 | 2017 | |
| 142 | Argentina | 8 | 2008 | |
| 143 | Estonia | 8 | 2013 | |
| 144 | Suriname | 8 | 2015 | |
| 145 | Lebanon | 8 | 2017 | |
| 146 | Syria | 8 | 2013 | |
| 147 | Norway | 8 | 2016 | |
| 148 | Lithuania | 8 | 2016 | |
| 149 | Tajikistan | 8 | 2003 | |
| 150 | Canada | 8 | 2016 | |
| 151 | Belarus | 8 | 2017 | |
| 152 | Latvia | 8 | 2016 | |
| 153 | Brunei | 8 | 2017 | |
| 154 | Serbia | 8 | 2017 | |
| 155 | Israel | 8 | 2009 | |
| 156 | Guatemala | 8 | 2017 | |
| 157 | Benin | 7 | 2014 | |
| 158 | Luxembourg | 7 | 2016 | |
| 159 | Malta | 7 | 2016 | |
| 160 | Bhutan | 7 | 2017 | |
| 161 | Dominica | 7 | 2016 | |
| 162 | Tuvalu | 7 | 2016 | |
| 163 | Georgia | 7 | 2017 | |
| 164 | Monaco | 7 | 2017 | |
| 165 | Croatia | 6 | 2016 | |
| 166 | United Arab Emirates | 6 | 2016 | |
| 167 | Virgin Islands (British) | 6 | 2011 | |
| 168 | Saint Kitts And Nevis | 6 | 2012 | |
| 169 | Kuwait | 6 | 2009 | |
| 170 | Bermuda | 6 | 2015 | |
| 171 | Comoros | 4 | 2017 | |
| 172 | Libya | 4 | 2006 |