<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2009) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (May 2009) (Learn how and when to remove this template message) </Td> </Tr> <P> Twelfth grade, senior year, or grade 12 is the final year of secondary school in North America . In other regions it is also equivalently referred as class 12 or Year 13 . In most countries students then graduate at age 17--18 . Some countries have a thirteenth grade, while other countries do not have a 12th grade / year at all . Twelfth grade is typically the last year of high school; graduation year . </P> <P> In Australia, the twelfth grade is referred to as Year 12 . In New South Wales, students are usually 16 or 17 years old when they enter Year 12 and 17--18 years during graduation (end of year). A majority of students in Year 12 work towards getting an ATAR (Australian Tertiary Admission Rank) or OP (Overall Position, which applies only to students in the state of Queensland), which will allow them access to courses at university . In South Australia, this is achieved by completing the SACE; in Victoria, this is achieved by completing the VCE; in the Australian Capital Territory, this is achieved by completing the AST and in New South Wales this is achieved by completing the HSC . </P>

What is the last grade of high school