I teach students from wherever they are, my teaching philosophy is any person can master any subject of knowledge when giving proper and right tutoring and with hard working.
Once Upon a Time in very ancient days, a tired and bored boy running away from his private teacher's course went an wondering day trip, he encountered an old man who was scratching a huge thick iron stick on a rock with water, the boy was so curious and asked "what are you doing with this huge thick iron stick, Sir?"
The old man said "I am preparing it to become a sewing needle".
The boy said "wow, it would take a long time and take a huge effort, doesn't it?"
The old man said "well, don't you agree that eventually I will achieve what I desire to?"
The boy was so inspired by the words and what he saw, later on he become a famous general in ancient China. What is your thinking on that?