The position of Head of College was then disestablished .
The position of Head of College was then replaced with separate positions for Principal of Middle College ( Years 7 - 10 ) and Principal of Senior College ( Years 11 - 13 ) .
The position of Head of College was then disestablished and replaced with separate positions for Principal of Middle College ( Years 7 - 10 ) and Principal of Senior College ( Years 11 - 13 ) .