Can anyone pls recommend a GOOD (tried & tested only) Chinese tutor for my P4 son - Higher Chinese?

He has some attention issues, so will need someone who's experienced, FIRM, patient yet having high expectations. We need help on all components - following syllabus / compre / compo / oral.

We stay at Bukit Timah area, and would like tutor to come on weekdays 2x/week.

Personal recommendations are much appreciated. Thank you!