Partnership-example 2

Dear tutor,
In the example 2 page 76, the question asking show the amount assessed on the individual partners for all relevant tax year of assessment.
My question is why the answer showing the year as y/e 30/6/22 ; y/e 30/6/23, y/e 30/6/24 instead of based on the standard tax year from 5th April to 6th April?
Thank you