This horrible science teacher who would come in class late and test us randomly. She'd like make questions and grade us. Then she'd complain about random stuff, the bell rang, she gave us around 10 pages to study at home and to the same the next time.
After two years, I was voted "president of the class" so I exposed her in front of all the teachers and she got her **** together.
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( Triganometry, Algebra and Calculus) . I'm afraid to know what my students think of me. 
