| Age of Child | Date of Birth | SJIIS Department | Year Group |
| 3+ | 1 Sep 20 – 31 Aug 21 | Early Years | Nursery |
| 4+ | 1 Sep 19 – 31 Aug 20 | Early Years | Reception |
| 5+ | 1 Sep 18 – 31 Aug 19 | Elementary | Year 1 |
| 6+ | 1 Sep 17 – 31 Aug 18 | Elementary | Year 2 |
| 7+ | 1 Sep 16 – 31 Aug 17 | Elementary | Year 3 |
| 8+ | 1 Sep 15 – 31 Aug 16 | Elementary | Year 4 |
| 9+ | 1 Sep 14 – 31 Aug 15 | Elementary | Year 5 |
| 10+ | 1 Sep 13 – 31 Aug 14 | Elementary | Year 6 |
| 11+ | 1 Sep 12 – 31 Aug 13 | High School | Year 7 |
| 12+ | 1 Sep 11 – 31 Aug 12 | High School | Year 8 |
| 13+ | 1 Sep 10 – 31 Aug 11 | High School | Year 9 |
| 14+ | 1 Sep 09 – 31 Aug 10 | High School | Year 10 |
| 15+ | 1 Sep 08 – 31 Aug 09 | High School | Year 11 |
| 16+ | 1 Sep 07 – 31 Aug 08 | A-Level | Year 12 |
| 17+ | 1 Sep 06 – 31 Aug 07 | A-Level | Year 13 |
