HK Certificate Examination,graduated with 1st class honour B.A(math) at HKU, accepted to do PHD without going thro MSc. He turned down the offer, took up a teaching job with pay I guess less than US$100/month in a roof top shanty school bcos he wanted to serve the people. My hat off to him)

https://en.wikipedia.org/wiki/Jasper_Tsang_Yok-sing