| SCHOOL | 1st Delegation | 2nd Delegation | 3rd Delegation | 4th Delegation | 5th Delegation | 6th Delegation |
| ACS Egham | China (SC) | Belarus | Costa Rica | | | |
| ÅS Videregaende Skole | India (SC) | Serbia | | | | |
| Bancroft’s School | Comoros | Colombia | Rwanda | Kyrgyzstan | | |
| Bishop Thomas Grant | Gabon (SC) | | | | | |
| Blackrock College | United Arab Emirates (SC) | | | | | |
| Boxhill School | Chile | | | | | |
| Cheadle Hulme | Ireland (SC) | Israel | South Africa | | | |
| Colegio Ayalde | Italy | Germany | Zimbabwe | Japan | | |
| Cours Saint Charles | Korea (Dem Rep) – North | Finland | | | | |
| Frankfurt Int’l School | France (SC) | Pakistan | Somalia | Hungary | | |
| George Cosbuc High School | Estonia | | | | | |
| Gordon’s School | Norway (SC) | Qatar | Portugal | | | |
| Harris Academy, Bermondsey | Cuba | Haiti | | | | |
| Holy Child School, Killiney | Lebanon | | | | | |
| Hurstpierpoint College | Russian Federation (SC) | Australia | Canada | Korea (Rep) – South | Saudi Arabia | Singapore |
| Institute of Education, Dublin | Egypt | | | | | |
| Kings Monkton | Viet Nam | Oman | | | | |
| Lingfield College | Sri Lanka | Lithuania | | | | |
| Lycée François 1ere | Cambodia | | | | | |
| Newpark Comprehensive | Ethiopia | Fiji | Ecuador | Thailand | | |
| North London Collegiate School | Equatorial Guinea | Afghanistan | Morocco | | | |
| Rathdown | Mexico (SC) | Latvia | Libya | Senegal | | |
| Reigate Grammar School | Myanmar | Netherlands | | | | |
| Royal Russell School | Iran | Malaysia | Côte d’Ivoire | Greece | | |
| Santa Margarita Catholic HS | St Lucia | Sudan | | | | |
| Shrewsbury | Poland | Congo Dep Rep | | | | |
| St Andrew’s, Dublin | United Kingdom (SC) | Ukraine | Uganda | Türkiye | Tunisia | Trinidad & Tobago |
| St Gerard’s School | Ghana (SC) | Syria | Seychelles | | | |
| St Ives School | Kenya (SC) | Slovakia | | | | |
| St Joseph’s, Athens | United States of America (SC) | Algeria | Cyprus | Malta | New Zealand | Spain |
| St Mary’s, Cambridge | | | | | | |
| Ste Victoire Int’l School | Brazil (SC) | Indonesia | Kuwait | | | |
| Sutton Park, Dublin | Nepal | | | | | |
| Terenure College | Albania (SC) | South Sudan | | | | |
| Wesley College, Dublin | Iraq | Iceland | | | | |
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