Its an extremely challenging job\profession as its the job where the one has  to set the papers , worksheets , circulars etc. therefore teaching is an  extremely challenging job.
Teaching is known as one of the challenging jobs because it is not easy to make a child or person learn something and make him / her practice is throughout his/ her life.Teachers are those people who introduces a new way to everyone's lives.
Hope it helps and pls mark as the best answer. :-)

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