The UK's education system is ranked sixth best in the developed world, according to a global league table published by education firm Pearson. The first and second places are taken by Finland and South Korea. The rankings combine international test results and data such as graduation rates between 2006 and 2010. Sir Michael Barber, Pearson's chief education adviser, says successful countries give teachers a high status and have a "culture" of education.

Looking at the two top countries - Finland and South Korea - the report says that there are many big differences, but the common factor is a shared social belief in the importance of education and its "underlying moral purpose".

The report also emphasises the importance of high-quality teachers and the need to find ways to recruit the best staff. This might be about status and professional respect as well as levels of pay.

Her mother, Setsuko, lights another candle at her daughter's altar and says a prayer for her, as she does every day. She is convinced bullying at school was one of the main reasons Yumi killed herself. In the months preceding her suicide, Yumi told her mother she was being taunted by some of her classmates. "I called the school and spoke to her teacher," she says. "The teacher said, 'I'll deal with this problem' and never got back to me, so we assumed it was solved."

investigating the cause of her suicide, hearing from her parents, collecting as much information as possible including the possibility of bullying." The school also spoke to students, but school officials found no information that connected to her suicide, they said. A recent court case ruled in the school's favor. Yumi's parents filed an appeal to a higher court on Monday.

Real-life 'mean girls' 'Mean girls' grow up Living with cyber bullying Yumi hinted at bullying in the note she left behind, writing that her decision to take her life "may be because of some of my classmates, studies and exams." But the parents are still fighting a legal battle with the school and the Kitamoto Board of Education. The family alleges the school was negligent in bully prevention and investigating her suicide. Shinji Nakai claims the school only showed him a fraction of the investigation they carried out -- a claim the board of education rejects. In a statement to CNN, the Kitamoto Board of Education said it was "co-operative