What major changes in political, social and economic life occured during the Sui, Tang and Song?

In Sui Dynasty, the imperial examination started which is the first time that the good students can get chances to become officers. The handicraft got well development in this time.
In Tang Dynasty, the political system is the continue of Sui Dynasty. The most important thing is that the country began to making the curreny. Private worship couldnot do it any more.
The political system changed little in Song Dynasty. The sea business and shipbuilding industry developed fast in this period.