| IELTS | Internation English Language Testing System 
| Others |
| IELTS | International English Language and Testing System
| Others |
| IELTS | International English Language Test System
| Others |
| IELTS | International English Language Testing Service
| Others |
| IELTS | International English Language Testing Services
| Others |
| IELTS | International English Language Testing System
| Others |