I can help Marbro out here as I just recently passed my driver's test.
Over here we have no tiered system. Just learner's and driver's. You can get your learner's at 16 and it is just a written, multiple choice test about road rules, road signs, and a short section about vehicle controls. It's a joke. If you are younger than 18, you are restricted to a 125cc or smaller. If you are 18, you are unrestricted, so anything goes. Note that for your learner's, the restriction is applied to your current age, not your age when you got it.
For driver's, you have two options: Unrestricted licence or restricted licence. I still don't know why people get the restricted version, but basically if you show up on the day on a motorcycle 125cc or smaller, you're restricted to riding only 125cc or smaller bikes. Same for scooters and auto transmission. Anything larger than 125cc and manual and you are completely unrestricted.
The test itself is conducted on a "yard", which is basically a very small course with various lines painted on the road and a few speed traps. The examiner asks you to do a pre-trip inspection, in which you inspect and affirm verbally that all the important bits are there and working. Then you do some pre-determined manoeuvres in front of the examiner, which include pulling away and getting up to speed while staying within a narrow corridor and then stopping as close as possible to a cross on the road, performing emergency stops and swerves, going around bends and pulling away on an incline without moving backwards. And that's it, there's no road test. The whole thing minus paperwork takes about 25 minutes