Participation in private supplementary tutoring (PT) is a global educational phenomenon especially prevalent in East Asia. This study conducted a student-report questionnaire, collected school reports of mathematics achievement to track retrospective longitudinal variations of PT over half a year, and obtained an analysis of the impact of PT participation on mathematics achievement during the school semester and summer vacation. Results show that, during summer vacation, students’ participation in PT has a significant positive effect on their mathematics achievement; however, the effect is insignificant during the school semester. The findings enhance the knowledge about the effectiveness of PT and summer learning.

参与私人补习（PT）是一种全球性的教育现象，在东亚尤其普遍。这项研究进行了学生报告调查表，收集了学校关于数学成绩的报告，以追踪半年中PT的回顾性纵向变化，并分析了PT参与对学校学期和暑假期间数学成绩的影响。结果表明，暑假期间，学生参加PT对他们的数学成绩有显着的积极影响。但是，在学校学期中效果不明显。这些发现增强了有关PT和暑期学习有效性的知识。