Hi! I dont know if this is the one that u r talking about but Su-Zhe is a very famous mandarin school and lets see if it helps:
http://embhsc2.hkedcity.net/kindergarten/64.html
Just in case the link doesnt work, here are the info:
蘇浙小學校
KIANGSU & CHEKIANG PRIMARY SCHOOL
地址: 香港北角清華街３０號
Address: 30 CHING WAH STREET NORTH POINT HK
電話 Tel: 25704173 傳真 Fax: 28072739