Imperial Examination! Did I Walk on the Snow to Reach the Top of the Mountain?

The male protagonist comes from a shabby scholarly family in a small town in the south of the Yangtze River. His father was once a scholar, but he died in depression after offending the local squire. Only his mother and young sister are left in the family. He was talented and tenacious, and he had the ambition to "bring King Yao and Shun to the top, and then make customs pure", but he also knew that the world was complicated and needed to be taken step by step.