23. In the case of a school with registered pupils who were aged 15 or 16 on the 1st September at the commencement of the previous school year, the number of such pupils and the percentage of that number falling within the following categories–
(a)persons pursuing a course at any school or any course of further education;
(b)persons in employment;
(c)persons on a Youth Training Scheme;
(d)persons known to the governing body not to fall within the terms of (a), (b) or (c) above; and
(e)persons whom it is not known by the governing body whether they fall within any of the above categories.