well maybe you could do volunteer teaching if you are posted overseas....
want to know the challenge of being a teacher? well when you go back to school, ask your teacher how was his or her holiday. he/she will tell you, 'What holiday?' while you students are happily mucking around or relaxing in swimming pools, the teachers have to mark papers, set questions, attend work improvement workshops. but never mind about that.
observe the difficulty a teacher has in controlling an unruly class; a chinese teacher trying to teach a class of unmotivated potato eating students; the mathematically hopeless students strugggling with calculus and integration. but never mind that.
you also have to deal with the expecations of your superiors. then there is the politicking and backstabbing by fellow teachers.
with so much trouble why would anyone want to teach? i don't know.... ask a teacher perhaps.