| Entry Age (Cut-Off Date: September 1) | Learning Phase | IBO Model | ISB Model | USA/Canadian Model | Serbian Model | UK Model | French Model | German Model |
| 3 | Early Childhood | PYP | Pre-Kindergarten 3 | Pre-Kindergarten 3 | Vrtić | Nursery (F1) | PS | Kindergarten / Vorschule |
| 4 | Early Childhood | PYP | Pre-Kindergarten 4 | Pre-Kindergarten 4 | Vrtić | Reception (F2) | MS | Kindergarten / Vorschule |
| 5 | Primary School | PYP | Kindergarten | Kindergarten | Predškolsko | Year 1 | GS | Kindergarten / Vorschule |
| 6 | Primary School | PYP | Grade 1 | Grade 1 | 1. razred | Year 2 | CP | Grade 1 |
| 7 | Primary School | PYP | Grade 2 | Grade 2 | 2. razred | Year 3 | CE1 | Grade 2 |
| 8 | Primary School | PYP | Grade 3 | Grade 3 | 3. razred | Year 4 | CE2 | Grade 3 |
| 9 | Primary School | PYP | Grade 4 | Grade 4 | 4. razred | Year 5 | CM1 | Grade 4 |
| 10 | Primary School | PYP | Grade 5 | Grade 5 | 5. razred | Year 6 | CM2 | Grade 5 |
| 11 | Middle School | MYP | Grade 6 | Grade 6 | 6. razred | Year 7 | Sixième | Grade 6 |
| 12 | Middle School | MYP | Grade 7 | Grade 7 | 7. razred | Year 8 | Cinquième | Grade 7 |
| 13 | Middle School | MYP | Grade 8 | Grade 8 | 8. razred | Year 9 | Quatrième | Grade 8 |
| 14 | High School | DP | Grade 9 | Grade 9 (Freshman) | 1. razred | Year 10 | Troisième | Grade 9 |
| 15 | High School | DP | Grade 10 | Grade 10 (Sophomore) | 2. razred | Year 11 | Seconde | Grade 10 |
| 16 | High School | DP | Grade 11 | Grade 11 (Junior) | 3. razred | Year 12 | Première | Grade 11 |
| 17 | High School | DP | Grade 12 | Grade 12 (Senior) | 4. razred | Year 13 | Terminale | Grade 12 |
| 18 | School | Grade 13 |