I have got a Master Degree in Maths from the Chinese University of Hong Kong in 2004 and Bachelor degree in Engineering Physics from the Polytechnic University of Hong Kong in 1995.
I have taught HKCE Maths, Additional maths, Physics, Integrated Science and HKAL pure Maths for ten years, also, HKDSE Physics for ten years as well.
I think it is crucial to explain the know-how to students for the hidden tricks underneath the problems they encounter that leads them get perplexed.