<Tr> <Td> 9th Grade </Td> <Td> 15 (16) </Td> </Tr> <Tr> <Td_colspan="2"> High School </Td> </Tr> <Tr> <Td> 10th Grade </Td> <Td> 16 (17) </Td> </Tr> <Tr> <Td> 11th Grade </Td> <Td> 17 (18) </Td> </Tr>

How does the school system work in korea