Sorry I'm at work and can't type in Chinese, as the workplace hasn't got any software for typing Chinese.
Mr Shiu was a good teacher. He gave me lots of confidence and encouragement when I was a student. His style was: less homework but more in-class practice, so every in-class assignments are like mock exams.
Mr Tam taught Additional Maths. I wasn't impressed with his teaching. His English is surely not the best. I've heard that when he discussed things with the Jesuit Fathers. Maybe his English has improved in the last 20 years, but who knows?
Everyone seems to be interested in how Mr Tam became the Principal. I will share what I know. Mr Tam and a Mr Chan were both Assistant Principals when Fr Coghlan decided to retire. Mr Chan, for whatever reasons, suddenly resigned and transferred himself to the Education Department to become the Principal Curriculum Advisor (I think that was the job title in those days). Everyone at that time could see that Mr Chan was pushed aside.
After Mr Tam has become the Principal, he made changes to a lot of school policies, most of which were not welcomed by the parents and students.