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Continue to ChatPISA 2012 Analysis of School Variables Affecting Problem-Solving Competency: Turkey-Serbia Comparison - https://avesis.gazi.edu.tr/yayin/fb7cde8c-2e52-4296-a6d2-fb64a320fc21/pisa-2012-analysis-of-school-variables-affecting-problem-solving-competency-turkey-serbia-comparison