So far as i know about section 212 holding company F.Y.can not be end before subsidiary F.Y.
And this is because of, if holding company F.Y. ends before subsidiary company accounts so purpose of attaching document under section 212 of subsidiary company will get defeat.
Also section 212 provides if subsidiary F.Y. ending before holding F.Y.then two more statement will need to be attached for changes in % of holding & other material changes took during the period.however Gap between two cant exceed 6 months.
section does not provide for your situation.
i think you need to take help of section 213 to sum up both company F.Y. coincide .
Or change F.Y. of Subsidiary or holding so that subsidiary F.Y. can end before Holding company F.Y.