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Teaching four students in one class.
That are at four different grade levels in at least two different subjects.
Teaching one American and three Tanzanians. One of which has only been speaking English for only a year. Another who has been shoved through the public school system to Jr. High, despite the inability to math at a 2nd grade level.
Having a class of teenagers where more than half are less-than-eager to speak a single word, let alone engage in a class discussion.