how to keep on learning English at home?

I stay with my family and  enjoy Chinese New Year.

I can get up early in the school and study in the classroom. But when I back home, I don't know to keep on learning.  

Are we learning wrong English In China? I have been learning English since I was 12. And I remember the first class my english teacher said "sit down,please" and we replied "thank you".But recently I recognized that saying "sit down,please" isn't polite .When your boss is angry, he may say it. So we always get messages about how Chinese being rude in other country and we don't know why. Are we learning rude English?