香港專上學生聯會
Of Hakka ancestry, To was born in Hong Kong in 1966 and was raised in Choi Hung Estate. He was educated at the La Salle Primary School and the La Salle College. He was the president of the student union when he attended the Lingnan College and was the secretary-general of the Hong Kong Federation of Students from 1989 to 1990. During the Tiananmen Square protests of 1989 and he once went to Beijing to join the hunger strike.