Tian Qiuxiu (Left) and her sister Tian Xiaoting cook meals. Tian Qiuxiu shows her letter of admission. (Xinhua/Fan Junwei)

Most of the student are probably enjoying their last burden-free summer vacation before entering college. But for the students from poverty-stricken Longshan County in Hunan Province, their vacation is very heavy and stressful although they have got offers from key universities.