In the past, the scores of the postgraduate entrance examination were one, two, three and four, the fourth was economic, and the third was basically management. Since 2009, the number three and the number four have been merged, collectively known as the number three, which is suitable for students majoring in economics and management. So the math you asked about in economics is index three, but not all exams in economics and management are three. Every school is different, and some schools require it. Depending on the requirements of the school's graduate enrollment brochure.

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