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#Yahan He
Does private supplementary tutoring matter? The effect of private supplementary tutoring on mathematics achievement
数学课后学习教育研究 , 北京师范大学
Is private supplementary tutoring effective? A longitudinally detailed analysis of private tutoring quality in China
数学课后学习教育研究 , 北京师范大学
Does private supplementary tutoring matter in Chinese students’ learning of mathematics: a longitudinal study
数学课后学习教育研究 , 北京师范大学