Quizzes biology

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Hello, my teacher has once said that she gets all of her quizzes from the internet, but I can't find the site. Does anyone have any idea as to where grade 12, hard, biology quizzes may come from? The quizzes are brutal, and it would so great if I could see them ahead of time...and no it's not cheating. My teacher told us they were on the internet, I make s thousand study notes, and no matter how much I study her quizzes are impossible! Please help! Thanks!

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