Unless it has changed recently or different for p platers then if yo were caught doing 25 over, they take of 2k's and that makes 23k's which means you dont lose your license.
If you ever get pulled over in a construction area ask to see there engineer certfied tape measure, in any construction zone, before they start doing radar work they have to get the plans of the area from vic roads and measure with an engineer certified tape measure where every sign sign has been placed, if one of then is out that cant do any radar work, they need to do this every day they do radar work in the area, even if it is one of the constuction zones with permanantly fixed signs.