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Katie's teacher Mrs. Derkman is a finalist in the Teacher of the Year contest, and a contest official is coming to observe her teach class 3A. But when Katie suddenly turns into Mrs.Derkman, the teacher's chances don't look so good. How can Katie control a class full of out-of-control third-graders when she's just a third-grader herself Show more Show less #outer_postBodyPS { display: none; } #psGradient { display: none; } #psPlaceHolder { display: none; } #psExpand { display: none; } Katie's teacher Mrs. Derkman is a finalist in the Teacher of the Year contest, and a contest official is coming to observe her teach class 3A. But when Katie suddenly turns into Mrs.Derkman, the teacher's chances don't look so good. How can Katie control a class full of out-of-control third-graders when she's just a third-grader herself