| # | Flag | Country | Secondary education, duration (years)Secondary education, duration (years) | Year |
|---|---|---|---|---|
| 1 | Slovakia | 9 | 2018 | |
| 2 | Germany | 9 | 2018 | |
| 3 | Austria | 8 | 2018 | |
| 4 | Romania | 8 | 2018 | |
| 5 | Serbia | 8 | 2018 | |
| 6 | Sri Lanka | 8 | 2018 | |
| 7 | Turkey | 8 | 2018 | |
| 8 | Turkmenistan | 8 | 2018 | |
| 9 | San Marino | 8 | 2018 | |
| 10 | Croatia | 8 | 2018 | |
| 11 | Bulgaria | 8 | 2018 | |
| 12 | Hungary | 8 | 2018 | |
| 13 | Lithuania | 8 | 2018 | |
| 14 | Uzbekistan | 8 | 2018 | |
| 15 | Azerbaijan | 8 | 2018 | |
| 16 | Montenegro | 8 | 2018 | |
| 17 | Armenia | 8 | 2018 | |
| 18 | Bosnia and Herzegovina | 8 | 2018 | |
| 19 | Czech Republic | 8 | 2018 | |
| 20 | Italy | 8 | 2018 | |
| 21 | Republic of Macedonia | 8 | 2018 | |
| 22 | Monaco | 7 | 2018 | |
| 23 | Moldova | 7 | 2018 | |
| 24 | Madagascar | 7 | 2018 | |
| 25 | Samoa | 7 | 2018 | |
| 26 | Eritrea | 7 | 2018 | |
| 27 | Mongolia | 7 | 2018 | |
| 28 | Brazil | 7 | 2018 | |
| 29 | Mauritania | 7 | 2018 | |
| 30 | Malta | 7 | 2018 | |
| 31 | Mauritius | 7 | 2018 | |
| 32 | Suriname | 7 | 2018 | |
| 33 | Albania | 7 | 2018 | |
| 34 | Fiji | 7 | 2018 | |
| 35 | Senegal | 7 | 2018 | |
| 36 | New Caledonia | 7 | 2018 | |
| 37 | Niger | 7 | 2018 | |
| 38 | Sierra Leone | 7 | 2018 | |
| 39 | France | 7 | 2018 | |
| 40 | Gabon | 7 | 2018 | |
| 41 | Nepal | 7 | 2018 | |
| 42 | United Kingdom | 7 | 2018 | |
| 43 | New Zealand | 7 | 2018 | |
| 44 | Belarus | 7 | 2018 | |
| 45 | French Polynesia | 7 | 2018 | |
| 46 | Vanuatu | 7 | 2018 | |
| 47 | Slovenia | 7 | 2018 | |
| 48 | Pakistan | 7 | 2018 | |
| 49 | Guinea | 7 | 2018 | |
| 50 | Central African Republic | 7 | 2018 | |
| 51 | Republic of the Congo | 7 | 2018 | |
| 52 | Switzerland | 7 | 2018 | |
| 53 | Russia | 7 | 2018 | |
| 54 | Tonga | 7 | 2018 | |
| 55 | Ivory Coast | 7 | 2018 | |
| 56 | Solomon Islands | 7 | 2018 | |
| 57 | Seychelles | 7 | 2018 | |
| 58 | Vietnam | 7 | 2018 | |
| 59 | Haiti | 7 | 2018 | |
| 60 | Cameroon | 7 | 2018 | |
| 61 | Tunisia | 7 | 2018 | |
| 62 | Bangladesh | 7 | 2018 | |
| 63 | India | 7 | 2018 | |
| 64 | Ukraine | 7 | 2018 | |
| 65 | Iceland | 7 | 2018 | |
| 66 | Burkina Faso | 7 | 2018 | |
| 67 | United Arab Emirates | 7 | 2018 | |
| 68 | Kyrgyzstan | 7 | 2018 | |
| 69 | Kiribati | 7 | 2018 | |
| 70 | Comoros | 7 | 2018 | |
| 71 | Tajikistan | 7 | 2018 | |
| 72 | Djibouti | 7 | 2018 | |
| 73 | Kuwait | 7 | 2018 | |
| 74 | Burundi | 7 | 2018 | |
| 75 | Kazakhstan | 7 | 2018 | |
| 76 | Laos | 7 | 2018 | |
| 77 | Tuvalu | 7 | 2018 | |
| 78 | Togo | 7 | 2018 | |
| 79 | Liechtenstein | 7 | 2018 | |
| 80 | Benin | 7 | 2018 | |
| 81 | Chad | 7 | 2018 | |
| 82 | Luxembourg | 7 | 2018 | |
| 83 | Algeria | 7 | 2018 | |
| 84 | Bermuda | 7 | 2018 | |
| 85 | Brunei | 7 | 2018 | |
| 86 | Curacao | 6 | 2018 | |
| 87 | Afghanistan | 6 | 2018 | |
| 88 | Angola | 6 | 2018 | |
| 89 | Argentina | 6 | 2018 | |
| 90 | Australia | 6 | 2018 | |
| 91 | Belgium | 6 | 2018 | |
| 92 | Bahrain | 6 | 2018 | |
| 93 | Bolivia | 6 | 2018 | |
| 94 | The Bahamas | 6 | 2018 | |
| 95 | Bhutan | 6 | 2018 | |
| 96 | Belize | 6 | 2018 | |
| 97 | Canada | 6 | 2018 | |
| 98 | Democratic Republic Of Congo | 6 | 2018 | |
| 99 | Chile | 6 | 2018 | |
| 100 | China | 6 | 2018 | |
| 101 | Colombia | 6 | 2018 | |
| 102 | Cuba | 6 | 2018 | |
| 103 | Cape Verde | 6 | 2018 | |
| 104 | Cyprus | 6 | 2018 | |
| 105 | Denmark | 6 | 2018 | |
| 106 | Dominican Republic | 6 | 2018 | |
| 107 | Ecuador | 6 | 2018 | |
| 108 | Estonia | 6 | 2018 | |
| 109 | Egypt | 6 | 2018 | |
| 110 | Spain | 6 | 2018 | |
| 111 | Ethiopia | 6 | 2018 | |
| 112 | Finland | 6 | 2018 | |
| 113 | Federated States of Micronesia | 6 | 2018 | |
| 114 | Georgia | 6 | 2018 | |
| 115 | Ghana | 6 | 2018 | |
| 116 | Gambia | 6 | 2018 | |
| 117 | Equatorial Guinea | 6 | 2018 | |
| 118 | Greece | 6 | 2018 | |
| 119 | Guatemala | 6 | 2018 | |
| 120 | Guinea-Bissau | 6 | 2018 | |
| 121 | Hong Kong | 6 | 2018 | |
| 122 | Honduras | 6 | 2018 | |
| 123 | Indonesia | 6 | 2018 | |
| 124 | Israel | 6 | 2018 | |
| 125 | Iraq | 6 | 2018 | |
| 126 | Iran | 6 | 2018 | |
| 127 | Jordan | 6 | 2018 | |
| 128 | Japan | 6 | 2018 | |
| 129 | Kenya | 6 | 2018 | |
| 130 | Cambodia | 6 | 2018 | |
| 131 | North Korea | 6 | 2018 | |
| 132 | South Korea | 6 | 2018 | |
| 133 | Cayman Islands | 6 | 2018 | |
| 134 | Lebanon | 6 | 2018 | |
| 135 | Liberia | 6 | 2018 | |
| 136 | Latvia | 6 | 2018 | |
| 137 | Libya | 6 | 2018 | |
| 138 | Morocco | 6 | 2018 | |
| 139 | Mali | 6 | 2018 | |
| 140 | Myanmar | 6 | 2018 | |
| 141 | Macao | 6 | 2018 | |
| 142 | Malawi | 6 | 2018 | |
| 143 | Mexico | 6 | 2018 | |
| 144 | Malaysia | 6 | 2018 | |
| 145 | Nigeria | 6 | 2018 | |
| 146 | Netherlands | 6 | 2018 | |
| 147 | Norway | 6 | 2018 | |
| 148 | Nauru | 6 | 2018 | |
| 149 | Oman | 6 | 2018 | |
| 150 | Panama | 6 | 2018 | |
| 151 | Papua New Guinea | 6 | 2018 | |
| 152 | Poland | 6 | 2018 | |
| 153 | Puerto Rico | 6 | 2018 | |
| 154 | Portugal | 6 | 2018 | |
| 155 | Palau | 6 | 2018 | |
| 156 | Paraguay | 6 | 2018 | |
| 157 | Qatar | 6 | 2018 | |
| 158 | Rwanda | 6 | 2018 | |
| 159 | Saudi Arabia | 6 | 2018 | |
| 160 | Sweden | 6 | 2018 | |
| 161 | São Tomé and Príncipe | 6 | 2018 | |
| 162 | El Salvador | 6 | 2018 | |
| 163 | Syria | 6 | 2018 | |
| 164 | Thailand | 6 | 2018 | |
| 165 | East Timor | 6 | 2018 | |
| 166 | Tanzania | 6 | 2018 | |
| 167 | Uganda | 6 | 2018 | |
| 168 | United States | 6 | 2018 | |
| 169 | Uruguay | 6 | 2018 | |
| 170 | Yemen | 6 | 2018 | |
| 171 | Zimbabwe | 6 | 2018 | |
| 172 | South Sudan | 6 | 2018 | |
| 173 | Marshall Islands | 6 | 2018 | |
| 174 | Virgin Islands (US) | 6 | 2018 | |
| 175 | American Samoa | 6 | 2018 | |
| 176 | Andorra | 6 | 2018 | |
| 177 | Saint Kitts And Nevis | 5 | 2018 | |
| 178 | Aruba | 5 | 2018 | |
| 179 | Jamaica | 5 | 2018 | |
| 180 | Republic of Ireland | 5 | 2018 | |
| 181 | Guyana | 5 | 2018 | |
| 182 | Grenada | 5 | 2018 | |
| 183 | Trinidad and Tobago | 5 | 2018 | |
| 184 | Dominica | 5 | 2018 | |
| 185 | Antigua and Barbuda | 5 | 2018 | |
| 186 | Costa Rica | 5 | 2018 | |
| 187 | Sint Maarten | 5 | 2018 | |
| 188 | South Africa | 5 | 2018 | |
| 189 | Zambia | 5 | 2018 | |
| 190 | Sudan | 5 | 2018 | |
| 191 | Botswana | 5 | 2018 | |
| 192 | Saint Lucia | 5 | 2018 | |
| 193 | Barbados | 5 | 2018 | |
| 194 | Peru | 5 | 2018 | |
| 195 | Nicaragua | 5 | 2018 | |
| 196 | Namibia | 5 | 2018 | |
| 197 | Mozambique | 5 | 2018 | |
| 198 | Maldives | 5 | 2018 | |
| 199 | Saint Vincent and the Grenadines | 5 | 2018 | |
| 200 | Venezuela | 5 | 2018 | |
| 201 | Virgin Islands (British) | 5 | 2018 | |
| 202 | Swaziland | 5 | 2018 | |
| 203 | Turks And Caicos Islands | 5 | 2018 | |
| 204 | Lesotho | 5 | 2018 | |
| 205 | Singapore | 4 | 2018 | |
| 206 | Philippines | 4 | 2018 |