Since its establishment, TKGS has hosted trainees from the Teachers' Training Course (TTC), and has served as a workshop for Home Economics students.

In January 1966, the school was expanded to include another four-storey block which housed Science laboratories, classrooms and special rooms.

A new cookery room was added to the domestic Science block and the canteen was extended to cater to the increased number of students.

The landmark sculpture, the "Spirit of TKGS", was commissioned and unveiled by Education Minister Teo Chee Hean during the school's official opening.

Class periods were extended to 50 minutes in 2003, and in 2005, TKGS announced that it would be one of the first schools in Singapore to offer Drama as an examinable 'O' Level subject.

TKGS now has an enrolment of 1,388 students and around 120 staff, and offers all the Pure Sciences, Economics, Drama, and Music in addition to the normal curriculum.

Students with good academic results from China, Brunei and Southeast Asian countries are also invited to join the school.