If you are a non-swimmer, and don’t want to win the champion in Asian cup,I can teach you , but if you wanna improve your skill to the competitions, then taking the classes in many sport centres will help you.
As I know Zhong- Shan sport centre near Zhang Shan MRT station does offer that kind of private adult class to help some proffessional swimmer.
Address: No.2, lane 44, Sec. 2, Zhongshan North Road
number:02-2581-1060