The Travelling Alburys

Hello, this is my first question (probably of many...) We are looking at moving to Australia in 2016 when my son has finished his GCSE's - Can anyone tell me what level of schooling he would go into? Would it be college? And when do they take exams and get ready for university? And is the school year any different? i.e.. does it go from September to July like in England? - thank you