Why parents send their children for tuition classes?

@kunizzul (1067)
November 19, 2008 11:16pm CST
Lately, in my country, the newspaper have been highlighting the achievement of students who excel in public examinations without the help of tuition class. So, its come up to my mind that is there really need to send students for tuition class. Did they think that school teachers are not doing a good job in school? What do you think about it? Does this happens in your country too?=)