Sherifa has six classes in a row today. In the school's science laboratory, she is showing her eight-year-old students the candle and oxygen experiment. This is a favourite part of the job for Sherifa.
"My only problem is to control this huge number of students – more than 30. I can't be nice and patient the whole time. I shout at them, punish them and even smack them sometimes. They think I am a tough teacher."