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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)	5^th class
10 years 6 months – 12 years 11 months	CAT4 Level D	Y7	S1	Y8 (F1)	End of 5^th class/ 6th class
11 years 6 months – 13 years 11 months	CAT4 Level E	Y8	S2	Y9 (F2)	End of 6^th class/ 1^st Year
12 years 6 months – 15 years 11 months	CAT4 Level F	Y9 & Y10	S3 & S4	Y10 & Y11 (F3 & F4)	2nd and 3^rd Year
14 years 6 months – 17 years +	CAT4 Level G	Y11+	S5 & S6	Y12+ (F5+)	4^th/TY/5^th 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.