Taken from a TransPerth flyer:

From Sunday 31 January 2016, there will be changes to the Joondalup, Fremantle and Armadale lines. There will also be changes to a number of school services across the TransPerth network.

Students intending to travel to school via public transport should:

The JourneyPlanner will be updated with the new school services from 15 January 2016. Remember to change the day in JourneyPlanner to the first day of school.

Whilst not every school will be undergoing changes, we recommend that everyone should plan their journey prior to the first day of school.