I can only really say this for NSW, and I assume all the other states are similar:
It is compulsory to go from Kidergarten to Year 10. IN year 10, you do the School Certificate (SC). This determines if you are eligible to go onto year 11 and year 12. If you don't wanna go into year 11, or failed your SC, you can:
-get a job
-or get an apprenticeship
Well, when you get up to Year 12, you'll be around 17 or 18 years old. At the end, you do the Higher School Certificate (HSC) exams, which determines if you'll be able to get into the University course you want. Most people go straight to University after High School, but I believe that number is falling.
If you don't get into Uni, and/or failed the HSC, then you can do a number of things:
-First, you can go to TAFE, which is like a lower form of Uni.
-Second, do either of the two things above
-Third, you can just bludge your way through life, and learn things yourself.
-And finally, you can repeat Year 12, and do your HSC again. I think with this option, you have a maximum of four tries.
I went straight to Uni.


Infernal's going to TAFE, and Mario is at school AND doing TAFE.
That's the basic crust of it. If there's more to the NSW school system, then Mario and Infernal, feel free to add to that.