It's tiring - exhausting. It requires a lot of patience. It demands creativity and flexibility. It somehow gets you confused, because it turns out that teaching four kids with different strengths and weaknesses are arduous.
It's bewildering, because the strategy that works on the theory you learned might not work on some kids. It pretty much drains thought and energy.
Yet seeing that look on their face, listening something popped out of their mind, and spotting them doing something unpredictable, those are satisfying.
And seeing them progress and be better each day is priceless. It is worth every drops of sweat.