I don't know how things work in Australia but in the US, most docs wouldn't put a child on medication until they are around 6 anyway. When does he turn 6? Even if you don't medicate, though, if you have a diagnosis you can ask for modifications/accommodations in the classroom, although in kindergarten probably not much is expected anyway. I would probably see how he does and then at the end of the school year (or sometime after he turns 6), if you still have concerns, ask the teacher fill out an ADHD inventory. You can get it from the school psych or his doctor. You can take it to the doctor and never let the school know the results, unless you want to.
