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| Age range | CAT4 level | England & Wales | Scotland | Northern Ireland | Ireland |
| 6 years – 7 years 11 months | CAT4 Level X (not available) | Y2 | P3 | Y3 (P3) | 1st class |
| 7 years – 8 years 11 months | CAT4 Level Y (not available) | Y3 | P4 | Y4 (P4) | 2nd class |
| 6 years 8 months to 8 years 11 months | CAT4 Level Pre-A (not available) | Y3 | P4 | Y4 (P4) | 2nd class |
| 7 years 6 months – 9 years 11 months | CAT4 Level A | Y4 | P5 | Y5 (P5) | 3rd class |
| 8 years 6 months – 10 years 11 months | CAT4 Level B | Y5 | P6 | Y6 (P6) | 4th class |
| 9 years 6 months – 11 years 11 months | CAT4 Level C | Y6 | P7 | Y7 (P7) | 5th class |
| 10 years 6 months – 12 years 11 months | CAT4 Level D | Y7 | S1 | Y8 (F1) | End of 5th class/ 6th class |
| 11 years 6 months – 13 years 11 months | CAT4 Level E | Y8 | S2 | Y9 (F2) | End of 6th class/ 1st Year |
| 12 years 6 months – 15 years 11 months | CAT4 Level F | Y9 & Y10 | S3 & S4 | Y10 & Y11 (F3 & F4) | 2nd and 3rd Year |
| 14 years 6 months – 17 years + | CAT4 Level G | Y11+ | S5 & S6 | Y12+ (F5+) | 4th/TY/5th Year |
As you can see there is some overlap in the age groups which may initially be confusing but helps immensely when testing different age groups in the same cohort – it provides more flexibility in the testing and catches more children in a single test allowing for easier comparison and group scores.