He later trained as a teacher, obtaining a Graduate Diploma of Education and a Master of Education at the University of Hong Kong and began his teaching career at Pui Kiu Middle School, going on to become the principal of the school in 1986.
He later trained as a teacher, obtaining a Graduate Diploma of Education in 1981 and a Master of Education at the University of Hong Kong in 1983. Tsang began his teaching career at Pui Kiu Middle School, going on to become the principal of the school in 1986.