What's so great about Nanyang primary school? Why is it considered the top school in sg?

Here the unofficial ranking based on t-scores gathered I think: http://mustsharenews.com/2015-psle-results/ Based on this list, Nanyang Primary School appeared to be the top school that has the highest t-score for PSLE in 2015. To me, I would say that there are no bad schools and all the schools aimed to provide the best education and to aid a child identify and grow his/her potential, be it academic or in other areas. In addition to learning from the teachers, parents must also play a part to help guide the child. With proper guidance, I believe that the child will benefit from whichever school he/she is enrolled in. Just my two cents though.