<Tr> <Td> Score </Td> <Td> Rank </Td> <Td> Score </Td> <Td> Rank </Td> </Tr> <Tr> <Td> Singapore </Td> <Td> </Td> <Td> 643 </Td> <Td> </Td> <Td> 607 </Td> <Td> </Td> </Tr> <Tr> <Td> Japan </Td> <Td> </Td> <Td> 605 </Td> <Td> </Td> <Td> 571 </Td> <Td> </Td> </Tr> <Tr> <Td> South Korea </Td> <Td> </Td> <Td> 607 </Td> <Td> </Td> <Td> 565 </Td> <Td> </Td> </Tr>

Who introduced streaming into the education system singapore